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

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

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

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

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

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

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

The oldest surviving botanic garden in the United States.

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.

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

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

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

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

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

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

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

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

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

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

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

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

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

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