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

This extraordinary Depression-era expenditure was modeled after a postcard of a Mediterranean hotel.

Pennsylvanian mass grave and possibly mass murder.

Destructive children, start your engines.

A completely round house designed for the Atomic Age.

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

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

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

Alexander Hamilton’s creation caused quite a bit of controversy.

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.

Huge masonic hall in Philadelphia with lavishly themed rooms.

This historic train station has been converted to a locomotive themed hotel.

A bizarre roadside attraction and the first instance of miniature golf in the world.

A retired tobacco farmer's pet project turned into a sturdy miniature city.

"Not too many people can say they've had a nuclear bomb dropped on them, not too many would want to." — Walter Gregg.

Who knew the Devil's domain was a hot spot for tubing?

This small museum dedicated to the painful memory of segregation is essentially a time capsule.

A mailbox that saved a nature reserve.

A curious collection of oddities including a lock of Alexander Hamilton's hair and Harry Houdini's ouija board.

A pig barn converted into one of the most eclectic residences in Nantucket.

The Atlantis of Cape Cod reemerges during the lowest of tides.

Since 1947, this living history museum has been providing an immersive look at life in Plymouth Colony.

This delicate museum is devoted to the art and industry that once supported Cape Cod's oldest town.