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

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

This jail which was in service for over a century is now open for curious visitors.

An indoor miniature village and labor of love for Laurence Geiringer, a model railroad enthusiast.

A toxic ghost town sitting atop a massive coal fire.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A dilapidated dock tells the story of Titanic's missed arrival.

A semi-scholarly approach to sex.

Elevated freight railway turned wildly successful urban park.

Ride the subways of yesteryear.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

An Olympic hero stripped of his medals is buried in a town he never visited, which took his name after his death.

Step inside Lucy, the world's largest "elephant."

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

Mysterious rocks that ring musically when struck.

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.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

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

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

World's first "penitentiary," meant to be humane, drove men insane.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

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