This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

In the early 1800s, surgery was also a show.

The first American department store, and home to the largest operating musical instrument in the world.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

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

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

A layered tribute to the work of mosaicist Isaiah Zagar.

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

A museum dedicated to the strange and extravagant costumes and memorabilia of the mummers, a tradition older than Philadelphia itself.

Middle-earth in the middle of Switzerland.

Study the Alien etchings in this fountain while you refill your water bottle.

This stately 19th century library pushed architectural boundaries at a time when the public library movement was just taking off.

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

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

The graffitied ruins stand hidden within the Pennsylvania woods.

A train station that was abandoned by the coal industry and was later converted into a cocktail bar.

A park in a small Pennsylvania town is home to an original sculpture by one of its native sons, legendary artist and activist Keith Haring.

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

This Civil War monument was designed by an eccentric architect and Gettysburg veteran.

Long before the Battle of Gettysburg occurred, dinosaurs roamed the area and left their footprints on this bridge.

This monument marks the beginning journey of a wounded soldier's leg that ended up almost two states away.

This covered bridge was used by both Union and Confederate troops during the Battle of Gettysburg in 1863.

An abandoned stretch of highway, deteriorating next to the operational one.