New Jersey sits between New York and Philadelphia — and its abandoned landscape reflects a state that industrialized early, institutionalized massively, and has been trying to redevelop ever since. WWI munitions bunkers in the Pine Barrens. A psychiatric hospital that became a rite of passage for generations of North Jersey teens. An abandoned Warner Bros. safari park. Here are 5 of the best abandoned places in New Jersey, selected from our Abandoned Places Map USA — 5,000+ GPS locations across the United States.
Why New Jersey Is a Hidden Gem for Abandoned Buildings & Urban Exploration
New Jersey's urbex landscape is shaped by density — the most densely populated state in America built hospitals, factories, military sites, and resort infrastructure at extraordinary scale, then abandoned them just as rapidly. The Pine Barrens alone contain enough WWI industrial ruins, ghost towns, and forgotten factories for weeks of exploration.
1. Marlboro Psychiatric Hospital – 1930s State Asylum Closed 1998, Ward Buildings Still Standing in Central New Jersey (Known Location)
Opened in the 1930s and operating until 1998, Marlboro Psychiatric Hospital in Monmouth County housed thousands of patients across its campus of red-brick ward buildings. After closure, the state transferred the property but many of the original hospital buildings were left standing — long ward corridors with original metal-frame doors, patient rooms, and the underground tunnel network connecting the campus. A legendary site in New Jersey urbex for decades, it remains one of the most documented abandoned psychiatric campuses in the state. One of the most iconic abandoned places in New Jersey for institutional photography.
🔗 Learn more: Wikipedia – Marlboro Psychiatric Hospital
2. Six Flags Wild Safari Animal Park Ruins – Warner Bros. Safari Opened 1972, Abandoned 1984, Cages and Infrastructure Still Visible, Jackson (Known Location)
Warner Bros. opened this safari park in 1972 with over 1,500 animals roaming across 350 acres of central New Jersey. After operating for just over a decade, the animal park was closed in 1984 when Six Flags shifted focus to rides. The original safari infrastructure — animal enclosures, keeper buildings, fencing systems, and vehicle shelters — was left in place as the ride park expanded around it. Layers of overgrown enclosures and abandoned safari infrastructure visible within the Six Flags property make this one of the most unusual urbex situations in New Jersey — an abandoned zoo inside an active amusement park.
🔗 Also read: Top 5 Best Abandoned Places in the USA →
Abandoned Places Map USA 🇺🇸
Explore All 5000+ Locations →3. Bethlehem Loading Company Munitions Plant – 1910 WWI Explosives Factory, 27 Miles of Trails Through the Ruins, Burlington County (Exclusively on Our Map)
Built in 1910 by the Bethlehem Loading Company for WWI munitions production, the complex covers a vast area of Burlington County with over 27 miles of trails threading through the ruins — concrete bunkers, loading platforms, rail infrastructure, and the adjacent Smith-Ireland Cemetery dating to the 1800s. The scale of the site and its deep Pine Barrens setting make it one of the best abandoned places in New Jersey for industrial archaeology. Exact location available on our Abandoned Places Map USA.
4. Van Slyke Castle – 1900s Stone Hilltop Mansion Built by a Stockbroker, Burned and Abandoned, Ramapo Mountain State Forest (Exclusively on Our Map)
Built in the early 1900s by stockbroker William Porter as a dramatic hilltop retreat in the Ramapo Mountains, Van Slyke Castle's stone walls and archways still frame sweeping views across northern New Jersey after decades of abandonment and a fire that gutted the interior. The castle-like construction, the forest setting, and the panoramic hilltop views make this one of the most photogenic abandoned places in New Jersey. Exact location available on our Abandoned Places Map USA.
5. Asbury Park Casino and Carousel House – 1920s Boardwalk Landmark Empty for Decades, Art Deco Dome Still Standing on the Shore (Exclusively on Our Map)
The Asbury Park Casino and its adjacent Carousel House dominated the boardwalk for decades — Art Deco dome architecture, ornate facades, and the energy of a Jersey Shore resort at its peak. After the city's economic collapse in the 1970s, both buildings sat empty for over 30 years, their interiors stripped but their distinctive exteriors intact on the oceanfront. One of the best abandoned places in New Jersey for mid-century coastal Americana. Exact location available on our Abandoned Places Map USA.
Safety Tips for Urban Exploration in New Jersey
- Pine Barrens navigation: the trail network is easy to get turned around in — always carry offline GPS and never rely solely on cell signal
- Asbestos: universal in pre-1980 institutional and industrial buildings — always wear an FFP2 mask
- Never explore alone — always bring at least one other person and let someone know your location
The urbex code applies everywhere: "Take nothing but photographs, leave nothing but footprints."
❓ FAQ – Abandoned Places in New Jersey
What is the most famous abandoned place in New Jersey?
Marlboro Psychiatric Hospital in Monmouth County — a 1930s state asylum closed in 1998 with ward buildings still standing, long regarded as one of the defining institutional urbex sites in the northeastern United States.
Is Overbrook Asylum still standing?
No — Overbrook Asylum (Essex County Hospital Center) in Cedar Grove was demolished between 2016 and 2018. It was one of the most famous urbex sites in New Jersey for decades before its demolition.
Are there abandoned places in the New Jersey Pine Barrens?
Yes — the Pine Barrens contain an extraordinary concentration of WWI munitions factories, 19th-century iron furnace ruins, ghost towns, and forgotten industrial sites scattered across over a million acres of protected forest.
🎯 Summary
New Jersey's abandoned buildings range from Pine Barrens WWI bunkers to a 1930s asylum that defined a generation of urbex, a Warner Bros. safari gone wild, and an Art Deco boardwalk dome on the Jersey Shore. Each of these 5 abandoned places in New Jersey captures a different layer of the most densely built — and frequently abandoned — state in America.
