The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

An emerald-green grotto just a short trip from Austin.

A super-sized promotional trick that is now a D.C. landmark.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

The United States Capitol's former columns still stand.

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

The final resting place of the tragic king and queen of the Jazz Age is tucked away in a small Maryland graveyard.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

Inspired by a foil-wrapped potato, (seriously) the Markel Building has been deemed one of the 10 ugliest buildings in the world.

The only recreation of William Shakespeare's indoor playhouse.

Outsider art meets paleontology at this roadside reptile repository.

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

This Virginia railway overpass is said to be haunted by a serial killer in a rabbit costume.

At 207 feet, one of the world's longest continuous escalators.

The house where John Wilkes Booth conspired with his co-conspirators.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

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

Art deco landmark on the outskirts of Washington, D.C.