Barry PhilipsLong Island is famous for its scenic beaches, wealthy neighborhoods, and deep historical roots, but beyond the polished surface lies a world of forgotten landmarks and abandoned sites. From deserted psychiatric hospitals to old military bunkers and ruined mansions, these places tell powerful stories of the past.
Many abandoned places in Long Island have become iconic because of their mystery, architecture, and ghostly reputation. Some were once major institutions serving thousands of people, while others symbolized wealth, innovation, or military strength before time left them behind.
Today, these locations continue to attract urban explorers, historians, photographers, and paranormal enthusiasts who want to discover Long Island’s hidden past. In this guide, we explore the top 10 abandoned places in Long Island, why they were abandoned, and what makes them so fascinating today.
Top 40 Abandoned Places in Long Island
1. Kings Park Psychiatric Center
The Kings Park Psychiatric Center is widely considered the most famous abandoned place in Long Island. Opened in 1885, it was once one of New York’s largest psychiatric hospitals. The massive campus included dozens of buildings spread across hundreds of acres and housed thousands of patients at its peak.
The hospital represented an era when large psychiatric institutions were common across the United States. Over time, changing treatment methods and deinstitutionalization reduced the need for these massive facilities. By the 1990s, most of the buildings were shut down, and the center officially closed in 1996.
Today, many of the towering brick buildings still stand, creating one of the eeriest landscapes on Long Island. Broken windows, empty corridors, and graffiti-covered walls have made it legendary among urban explorers.
Its haunting atmosphere has inspired countless ghost stories, making it one of the most talked-about abandoned locations in the region.
2. Pilgrim State Hospital
Located in Brentwood, Pilgrim State Hospital was once the largest psychiatric hospital in the world. Opened in 1931, it was designed to house over 13,000 patients and included farms, power plants, and its own internal infrastructure.
It functioned like a small city dedicated to mental healthcare. However, as psychiatric treatment changed and institutional care declined, much of the facility became unnecessary.
Many sections were shut down, leaving behind large empty buildings and forgotten hallways. While some parts remain active for healthcare purposes, significant portions became abandoned and gained a reputation among explorers.
Its enormous size and historical significance make Pilgrim State Hospital one of the most remarkable abandoned places in Long Island.
3. Camp Hero
Camp Hero in Montauk is one of the most mysterious abandoned places in Long Island. Originally built as a military defense base during World War II, it later became famous for conspiracy theories involving secret government experiments.
The base featured radar towers, underground facilities, and massive bunkers designed for coastal defense during the Cold War. Officially, it served as a military installation to protect the East Coast.
After operations ended, many of the structures were abandoned. Today, Camp Hero is part of a state park, but visitors can still see the old military ruins.
Its fame grew because of stories connected to the so-called Montauk Project, a conspiracy involving mind control and secret experiments. Whether true or not, the legend keeps attracting curious visitors.
4. Kings Park Bluff Ruins
Near the psychiatric center, the Kings Park Bluff Ruins are another haunting reminder of Long Island’s forgotten past. These ruins once supported hospital infrastructure and nearby industrial systems.
Located near the bluffs overlooking the Long Island Sound, the remains include crumbling foundations, tunnels, and decaying concrete structures slowly being reclaimed by nature.
The area offers a dramatic contrast between peaceful waterfront scenery and deteriorating architecture. Many photographers visit because of this striking visual effect.
The ruins show how even major institutions eventually fade, leaving behind silent reminders of what once existed.
5. Edgewood State Hospital Grounds
Before becoming parkland, the Edgewood area was home to a state hospital and tuberculosis sanatorium. These facilities cared for patients during a time when long-term institutional treatment was common.
As medicine improved and tuberculosis treatment advanced, the need for large sanatoriums declined. The buildings were gradually abandoned and later demolished.
Although most structures are gone today, the land still carries traces of its past. Old roads, hidden foundations, and local memories preserve the story of what once stood there.
It remains a quiet but powerful symbol of Long Island’s healthcare history.
6. The Vanderbilt Motor Parkway Ruins
The Vanderbilt Motor Parkway was one of America’s earliest highways, created by William K. Vanderbilt II for automobile racing and private travel. At the time, it was considered revolutionary.
As public highways expanded and transportation systems improved, the private roadway became less useful. Large portions were abandoned over time.
Today, old bridges, overgrown roadbeds, and forgotten sections of pavement still remain. These ruins represent a fascinating part of transportation history.
Unlike abandoned hospitals, the Vanderbilt Motor Parkway tells the story of Long Island’s role in the early automobile era.
7. Fort Tilden Bunkers
Although more closely associated with the larger New York coastal defense system, Fort Tilden’s abandoned bunkers remain important to Long Island’s military history.
These concrete structures were built to protect the coast from naval attacks during wartime. Hidden bunkers and military tunnels still stand as reminders of that era.
When military operations declined, many sections were left unused. Nature gradually reclaimed the site, blending beach landscapes with abandoned wartime architecture.
Visitors are often struck by the contrast between peaceful ocean views and the imposing defense structures.
8. The Freeport Spite House Ruins
The Freeport Spite House became famous because it was built out of revenge during a property dispute. Its unusually narrow design and awkward placement made it a local legend.
Although much of the original structure no longer exists, the story behind it continues to fascinate people.
The remains symbolize how personal conflict can become part of local history. Even without the full building standing, the legend remains alive in Long Island folklore.
Sometimes, abandoned places are remembered more for their stories than for their physical size.
9. Welwyn Preserve Estate Ruins
Located in Glen Cove, the Welwyn Preserve was once a grand Gold Coast mansion estate belonging to one of Long Island’s wealthy families.
The estate reflected the Gilded Age era when wealthy families built enormous mansions across the North Shore. While much of the original mansion is gone, ruins and preserved sections remain.
Stone walls, hidden pathways, and estate remnants still reveal the scale of its former luxury. Walking through the preserve feels like stepping into a forgotten era of wealth and elegance.
It is quieter than abandoned hospitals, but equally rich in historical significance.
10. The Old Kings Park Tunnels
Beneath the Kings Park Psychiatric Center lies a network of abandoned tunnels that once connected various buildings across the campus. These underground passages were used for utilities, maintenance, and transportation.
The tunnels have become famous among explorers because of their darkness, silence, and mysterious atmosphere. Graffiti-covered walls and stories of strange sounds have added to their eerie reputation.
Unlike the visible ruins above ground, the tunnels feel even more mysterious because much of their full layout remains unknown to the public.
They represent the hidden side of Long Island’s most famous abandoned institution and continue to fuel curiosity.
Comprehensive List
| Rank | Abandoned Place | Location | Former Purpose | Current Status |
|---|---|---|---|---|
| 1 | Kings Park Psychiatric Center | Kings Park | Psychiatric Hospital | Mostly abandoned |
| 2 | Pilgrim State Hospital | Brentwood | Mental Health Facility | Partially abandoned |
| 3 | Camp Hero | Montauk | Military Base | Historic park with abandoned structures |
| 4 | Kings Park Bluff Ruins | Kings Park | Hospital Infrastructure | Ruins remain |
| 5 | Edgewood State Hospital Grounds | Deer Park | Tuberculosis Sanatorium | Mostly demolished |
| 6 | Vanderbilt Motor Parkway Ruins | Lake Success | Historic Parkway | Abandoned remnants |
| 7 | Fort Tilden Bunkers | Near Long Island Region | Military Defense Site | Historic abandoned structures |
| 8 | Freeport Spite House Ruins | Freeport | Residential Landmark | Mostly gone |
| 9 | Welwyn Preserve Estate Ruins | Glen Cove | Mansion Estate | Ruins and preserved grounds |
| 10 | Old Kings Park Tunnels | Kings Park | Utility Tunnel System | Abandoned underground network |
| 11 | Central Islip Psychiatric Center | Central Islip | Psychiatric Hospital | Mostly abandoned |
| 12 | Nassau County Jail Ruins | East Meadow | Correctional Facility | Demolished remnants |
| 13 | Creedmoor State Hospital Grounds | Queens Border | Psychiatric Facility | Partially abandoned |
| 14 | Fort Totten Ruins | Bayside | Military Fort | Historic ruins remain |
| 15 | Glenwood Power Station | Yonkers Area Influence | Power Generation | Abandoned |
| 16 | Brookhaven Graphite Research Reactor Site | Upton | Scientific Research Facility | Restricted abandoned sections |
| 17 | South Brother Island Ruins | Near Long Island Sound | Quarantine Hospital | Ruins remain |
| 18 | Bannerman Castle Ruins | Hudson-linked Historic Site | Arsenal Storage | Historic ruins |
| 19 | Northport Power Plant Old Structures | Northport | Energy Facility | Partial abandonment |
| 20 | Plum Island Old Research Buildings | Off North Fork | Research Facility | Restricted and abandoned sections |
| 21 | Roosevelt Raceway Remains | Westbury | Horse Racing Track | Redeveloped remnants |
| 22 | Mitchel Field Old Structures | Garden City | Military Airfield | Partial ruins |
| 23 | Republic Aviation Ruins | Farmingdale | Aircraft Manufacturing | Mostly redeveloped |
| 24 | Grumman Aerospace Old Buildings | Bethpage | Aerospace Industry | Partial abandoned sections |
| 25 | Sands Point Estate Ruins | Sands Point | Mansion Estate | Ruins preserved |
| 26 | Hempstead Lake Old Industrial Ruins | Hempstead | Industrial Site | Ruins remain |
| 27 | Fort Slocum Ruins | Nearby Island Site | Military Base | Abandoned ruins |
| 28 | Old Long Beach Hospital Site | Long Beach | Hospital | Mostly demolished |
| 29 | Bay Shore Marina Ruins | Bay Shore | Marine Facility | Abandoned remains |
| 30 | Fire Island Old Coast Guard Station | Fire Island | Coast Guard Facility | Historic abandoned structures |
| 31 | Montauk Air Force Station | Montauk | Military Radar Base | Abandoned remnants |
| 32 | Belmont Park Old Stable Ruins | Elmont | Horse Racing Support | Partial ruins |
| 33 | Old Oyster Bay Estate Structures | Oyster Bay | Private Estate | Preserved ruins |
| 34 | Sag Harbor Industrial Wharf Ruins | Sag Harbor | Shipping and Trade | Abandoned remains |
| 35 | Jones Beach Old Service Tunnels | Jones Beach | Utility Infrastructure | Restricted abandoned tunnels |
| 36 | Shelter Island Manor Ruins | Shelter Island | Residential Estate | Ruins remain |
| 37 | Cold Spring Harbor Laboratory Old Structures | Cold Spring Harbor | Scientific Research | Historic remnants |
| 38 | Riverhead State Hospital Grounds | Riverhead | Healthcare Facility | Mostly abandoned |
| 39 | Old Patchogue Theater Backstage Ruins | Patchogue | Entertainment Venue | Partial abandoned sections |
| 40 | Lloyd Harbor Estate Ruins | Lloyd Harbor | Luxury Mansion Estate | Ruins preserved |
Why People Are Fascinated by Abandoned Places in Long Island
Abandoned places create a strange blend of beauty and mystery. They remind people that even the grandest buildings and strongest institutions can be forgotten over time. In Long Island, many of these locations were once major centers for healthcare, military defense, transportation, and elite living.
Urban explorers are drawn to these places because they offer access to hidden history. Paranormal investigators visit because many of these locations are believed to be haunted. Historians study them because they reflect important changes in society, especially in medicine, war, and architecture.
Long Island’s abandoned landmarks are especially compelling because they are connected to powerful stories involving mental health reform, Cold War defense systems, wealthy Gold Coast families, and local legends.
Safety Reminder for Visiting Abandoned Places
Many abandoned places in Long Island are dangerous and often restricted from public access. Risks include structural collapse, broken glass, asbestos exposure, unstable floors, and legal consequences for trespassing.
Visitors should always respect private property laws and prioritize safety above adventure. Exploring abandoned sites without permission can lead to serious injury or legal trouble.
For those interested in learning more, guided historical tours, public parks, and local museums are much safer ways to appreciate these locations.
History should be explored responsibly.
Comparison Table of the Top Abandoned Places in Long Island
| Rank | Abandoned Place | Location | Former Purpose | Current Status |
|---|---|---|---|---|
| 1 | Kings Park Psychiatric Center | Kings Park | Psychiatric Hospital | Mostly abandoned |
| 2 | Pilgrim State Hospital | Brentwood | Mental Health Facility | Partially abandoned |
| 3 | Camp Hero | Montauk | Military Base | Historic park with abandoned structures |
| 4 | Kings Park Bluff Ruins | Kings Park | Hospital Infrastructure | Ruins remain |
| 5 | Edgewood State Hospital Grounds | Deer Park | Tuberculosis Sanatorium | Mostly demolished |
| 6 | Vanderbilt Motor Parkway Ruins | Lake Success | Historic Parkway | Abandoned remnants |
| 7 | Fort Tilden Bunkers | Near Long Island Region | Military Defense Site | Historic abandoned structures |
| 8 | Freeport Spite House Ruins | Freeport | Residential Landmark | Mostly gone |
| 9 | Welwyn Preserve Estate Ruins | Glen Cove | Mansion Estate | Ruins and preserved grounds |
| 10 | Old Kings Park Tunnels | Kings Park | Utility Tunnel System | Abandoned underground network |
Related
Conclusion
The top 40 abandoned places in Long Island reveal a hidden side of the region that many people never get to see. Behind the beaches and luxury neighborhoods are forgotten hospitals, military bunkers, ruined estates, and mysterious tunnels that preserve powerful stories from another time.
From the haunting halls of Kings Park Psychiatric Center to the legendary secrets of Camp Hero, these locations continue to inspire curiosity and wonder. They remind us that history never truly disappears—it simply waits quietly to be rediscovered.
Whether you are a history lover, photographer, paranormal enthusiast, or simply curious about hidden places, Long Island’s abandoned landmarks offer unforgettable stories worth exploring.