The famous bell was secreted away and hidden in a church in Allentown during the British occupation of Philadelphia.

This jail which was in service for over a century is now open for curious visitors.

This huge, disused viaduct is now a crumbling concrete underworld of covered in years of graffiti.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

In which a local geological marvel becomes a quaint roadside attraction.

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

A modern ghost town whose inhabitants were driven away by the growth of nuclear power.

This abandoned Poconos resort is haunted by a history of kitschy romance and a violent fugitive.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

A toxic ghost town sitting atop a massive coal fire.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

World's first "penitentiary," meant to be humane, drove men insane.

This historic, one-acre island is the only legal place to camp in the city of Richmond.

America's second-oldest brick baseball stadium was home to a legendary WWII series that only sailors got to see.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

A museum dedicated exclusively to aircraft used in the military.

Under a playground is a little-known sealed train tunnel that likely contains the bodies of workers trapped by cave-ins.

The only recreation of William Shakespeare's indoor playhouse.

Inspired by a foil-wrapped potato, (seriously) the Markel Building has been deemed one of the 10 ugliest buildings in the world.