The oldest farmer's market in America is so ancient it was approved by the King of England.

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

The oldest surviving botanic garden in the United States.

This Old Testament garden features 100 plants from biblical times.

A beautiful oddities shop crammed with strange and morbid curiosities.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

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

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

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

A failed piece of Orientalism has become the proud symbol of a community.

When the Austin Dam failed it destroyed much of Austin...and then it failed again.

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

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

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

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

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

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

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

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

The origin of this mechanical boy was a mystery until he revealed his maker by writing it in perfect cursive.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

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

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

Mutant vegetables, transgenic mosquitos, and atomic rodents span the walls of this one-of-a-kind museum.