The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

The Home and murder site of the witch of Rehmeyers Hollow.

The ruined remains of a coal mining ghost town are hidden within the woods.

A quiet, gothic haven nestled between Pittsburgh's Squirrel Hill and Point Breeze neighborhoods.

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

The graffitied ruins stand hidden within the Pennsylvania woods.

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

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

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

The universally beloved children's television figure is interred on a high hilltop in one of western Pennsylvania's oldest cemeteries.

This might just be the TARDIS of bookstores.

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

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

This little museum in the town where zombies were born celebrates the living dead.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

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

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

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

A rare view of a preserved Victorian science museum.

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.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.