This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The birthplace of American international flight service has been turned into a celebrity's microbrewery.

Florida's oldest bar was once a morgue, complete with a hanging tree and gravestones.

"We Seceded Where Others Failed."

A Circus legend leaves an unexpected endowment.

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

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

The "lovely red Vega" of the legendary record-settling pilot.

Home to items never before seen by the public.

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

The site of the climactic scene from the classic horror film is now a historic landmark.

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