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

America's first federal monument.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Eighteen miniature death-scene dioramas.

Giftshop catering to cryptozoologists and anyone with a sense of humor.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

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

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.