The oldest surviving botanic garden in the United States.

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

Where America's first doomsday cult awaited the end of the world.

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

A miniature golf course crafted inside the world's largest simulated cave.

An otherwise quiet campground becomes a bustling medieval town for two weeks every year.

This Philly landmark has a giant butterfly pavilion, three floors of insect displays, and withstood a $40,000 heist.

A macabre farm reserved part of its 222-acres for dead bodies, all in the name of science.

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

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.

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

Eccentric concrete mansion and museum designed and built by hand from the inside out.

Huge masonic hall in Philadelphia with lavishly themed rooms.

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

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

A beautiful oddities shop crammed with strange and morbid curiosities.

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

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

House of vintage taxidermy and Steampunk sculptures in a quiet Pittsburgh neighborhood.

A rare view of a preserved Victorian science museum.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

This splendid Versailles-inspired mansion has the largest French-style formal gardens in North America.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

A Civil War Museum with some notable medical antiques.