The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

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

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

Dr Barnes' $25 billion private collection of art and arboretum.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

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

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

This church in Pittsburgh is home to the largest collection of religious relics in North America.

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

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

A park full of outsider art, created by college students studying outsider art.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

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

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

This might just be the TARDIS of bookstores.

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

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

In the woods of New Jersey lie the ruins of a munitions village abandoned after World War I and the remnants of a 1920s wooden racetrack.

An abandoned asylum where patients have been forgotten but their possessions remain.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

An unrealized dream to wirelessly electrify the entire Earth.