Philadelphia is America's first great city — and its abandoned landscape carries the weight of that history with unusual darkness. A prison where a doctor spent 23 years conducting illegal medical experiments on inmates without their knowledge. A decommissioned naval shipyard that once built the USS New Jersey. Crumbling Victorian industrial buildings along the Schuylkill and the Delaware. Here are 5 of the best abandoned places in Philadelphia, selected from our Abandoned Places Map USA — 5,000+ GPS locations across the United States.
Why Philadelphia Is a Hidden Gem for Abandoned Buildings & Urban Exploration
Philadelphia's urbex landscape is anchored by its extraordinary concentration of 19th-century institutional architecture — the city that built Eastern State Penitentiary, the nation's model prison, also built Holmesburg, its darkest successor. The Delaware River corridor and the Navy Yard carry layers of industrial and military history, while North Philadelphia contains some of the largest concentrations of abandoned residential and commercial buildings on the East Coast.
1. Holmesburg Prison – 1896 Prison Where Dr. Kligman Conducted Illegal Medical Experiments on Inmates for 23 Years, "The Terrordome," Closed 1995 (Known Location)
Opened in 1896 on the same spoke-and-wheel design as Eastern State Penitentiary, Holmesburg housed Philadelphia's most dangerous prisoners for nearly a century — earning the nickname "The Terrordome" after decades of riots, killings and what a Pennsylvania governor described in 1938 as conditions so horrific "the press has, if anything, understated the horror." Its most notorious chapter was the 23-year medical experiment program run by University of Pennsylvania dermatologist Dr. Albert Kligman, who used prisoners as test subjects for herpes, staphylococcus bacteria, psychoactive drugs, radioactive isotopes and carcinogenic dioxins — with the knowledge and funding of the US Army, Johnson & Johnson and Dow Chemical. The experiments ran from 1951 to 1974, touching an estimated 90% of the prison population. Holmesburg closed in 1995 and still stands — the decaying cell blocks, original spoke corridors and the building known as "The Klondike" where prisoners were steam-cooked to death in a 1938 hunger strike response all remain in place.
🔗 Learn more: Wikipedia – Holmesburg Prison
2. Philadelphia Naval Shipyard – Active 1876-1996, USS New Jersey Built Here, Dry Docks and Crane Infrastructure Still Standing (Known Location)
One of the oldest and largest naval shipyards in America, the Philadelphia Naval Shipyard built and repaired warships continuously from 1876 until its closure in 1996 under the Base Realignment and Closure Act — including the USS New Jersey, one of the most decorated battleships in US history. While portions of the 1,200-acre site have been redeveloped into a business park, significant sections of the original shipyard infrastructure remain in various states of abandonment: dry docks cut from Delaware River bedrock, 1940s-era repair shops, massive gantry cranes rusting above the waterfront and concrete piers where destroyers and cruisers once sat at anchor. One of the most historically significant and largest abandoned industrial sites in Philadelphia.
🔗 Also read: Top 5 Best Abandoned Places in the USA →
Abandoned Places Map USA 🇺🇸
Explore All 5000+ Locations →3. St. Bonaventure Church – 1906 Grand Catholic Parish Abandoned in the 1990s, Towering Nave Still Intact, North Philadelphia (Exclusively on Our Map)
A grand 1906 Catholic parish church in North Philadelphia, abandoned in the 1990s when the surrounding neighborhood's population collapsed following decades of deindustrialization — the towering nave still standing with original plaster ceiling medallions visible despite decades of water damage, stained glass frames empty where windows were stolen and the rose window tracery above the entrance intact against the sky. North Philadelphia's collection of abandoned Catholic parish churches is one of the most extraordinary concentrations of ecclesiastical decay in American urbex — each one a monument to an immigrant community that built for eternity and then moved on. One of the best abandoned places in Philadelphia for church photography. Exact location available on our Abandoned Places Map USA.
4. Abandoned Freihofer Bakery Complex – 1893 Industrial Bakery with Original Oven Infrastructure Still in Place, Nicetown (Exclusively on Our Map)
Built in 1893 by the Freihofer Vienna Baking Company on a four-acre property in North Philadelphia's Nicetown neighborhood, this industrial bakery complex operated for nearly a century before closure — original brick oven chambers still in place, industrial mixing equipment housings on the production floor and the distinctive multi-story brick construction of a late-Victorian food manufacturing facility. The bakery's history spans two centuries of Philadelphia bread production; the surviving buildings are among the most intact examples of 1890s food industry architecture still standing in the city. Exact location available on our Abandoned Places Map USA.
5. Abandoned Reading Railroad Viaduct – 1893 Brick Railway Elevated Structure, Callowhill Neighborhood, Philadelphia (Exclusively on Our Map)
A section of the 1893 Reading Railroad viaduct in the Callowhill neighborhood — a massive brick elevated railway structure that carried freight and passenger trains over North Philadelphia's street grid for nearly a century before abandonment. The arched brick viaduct spans several city blocks, its deck overgrown with volunteer trees and vegetation, the original iron rail fastenings still embedded in the concrete ties and the view from street level creating one of the most dramatically urban abandoned railway landscapes in the city. One of the best abandoned places in Philadelphia for industrial railway photography. Exact location available on our Abandoned Places Map USA.
Safety Tips for Urban Exploration in Philadelphia
- Structural instability: North Philadelphia's abandoned buildings have been exposed to decades of freeze-thaw cycles and neglect — always test floors before committing weight and avoid buildings with visible roof collapse
- Asbestos & lead: ubiquitous in pre-1980 buildings — always wear an FFP2 mask and avoid disturbing insulation, pipe lagging or ceiling tiles
- 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 Philadelphia
What is the most famous abandoned place in Philadelphia?
Holmesburg Prison — a 1896 facility where Dr. Albert Kligman conducted illegal medical experiments on inmates for 23 years with US Army and corporate funding, exposing an estimated 90% of the prison population to herpes, radioactive isotopes, psychoactive drugs and carcinogenic chemicals. Closed in 1995 and still standing, it is one of the darkest institutional sites in American urbex.
What was built at the Philadelphia Naval Shipyard?
The Philadelphia Naval Shipyard, operational from 1876 to 1996, built and repaired hundreds of US Navy vessels including the USS New Jersey — one of the most decorated battleships in American history. The 1,200-acre site still retains significant abandoned infrastructure including Delaware River dry docks, WWII-era repair shops and gantry crane structures.
Why does North Philadelphia have so many abandoned buildings?
North Philadelphia's deindustrialization from the 1960s onward caused one of the most severe population losses of any American urban neighborhood — factories closed, workers left and the Catholic immigrant parishes that anchored the community lost their congregations. The result is an extraordinary concentration of abandoned churches, industrial buildings and residential streets within the city.
🎯 Summary
Philadelphia's abandoned buildings carry some of the darkest institutional history in America — a prison where the military funded experiments on human beings for two decades, a shipyard that built warships for a century and a neighborhood of abandoned Catholic churches that were built to last a thousand years and emptied in a generation. Each of these 5 abandoned places in Philadelphia captures a different dimension of a city shaped equally by ambition, industry and the consequences of both.
