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

This recreation of a 19th-century dime museum is full of oddities.

Century-old shop, specializing in Occult products.

The aggressively banal name of this underground fortress of bureaucracy does little to evoke its truly surreal existence.

No one knows who painted this mysterious mural in a Penn State basement.

It marks the spooky spot where the bodies of two young boys were found in the 19th century.

A rock maze opens up to a panoramic viewpoint at an abandoned mine full of ghost stories.

The Cold War-era "underground Pentagon" is a sprawling subterranean hideaway for the Defense Department.

This forgotten building was one of the few Philadelphia-area breweries to survive Prohibition.