One of the oldest Jewish cemeteries in the city, it is now overgrown with an urban forest.

A uniquely lettered street sign marks the corner where the iconic word game was invented.

This small, hidden cove is home to abandoned boats.

This otherwise innocuous bodega was once the headquarters of the most feared assassin's guild in American history.

This iconic tattoo shop has its own onsite museum with artifacts from the early history of modern body art.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

Patrick Dougherty's fantastic living tree sculptures, mind-blowing but temporary.

The home used in just a few seconds of film that came to define the setting of a hit sitcom.

The site of the gruesome massacre—and maybe cannibalism—of five men, a tragedy that made Alferd Packer infamous.

Final resting place of a 19th century gold prospector and convicted cannibal.

A mental health hospital dating back more than 139 years, now features a museum.

The scene of one of the darkest moments in American labor history has been left essentially untouched since the tragedy.

A lost cemetery stands forgotten on a hilltop, known only to the older residents of Pomeroy.

The failure of one component toppled this entire bridge during rush hour.

The crash of this great airship signaled the beginning of the end for dirigibles.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

Hidden behind an empty field resides this early 19th-century cemetery.

Home of the only civilian casualty at the Battle of Gettysburg.

Don't get it twisted: This is the oldest pretzel bakery in the United States.

This Art Deco service station has been providing tune-ups and turning heads for close to a century.

Old neon signs from the City of Brotherly Love provide a snapshot of the city’s evolution.

This icon of the Atomic Age now lays dormant.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

Journey through a collection of over 35,000 Halloween items from all generations.