This labyrinthine resting place of Black American leaders has been reclaimed by nature.

Colorful murals stationed throughout Charlotte bring poetry to everyone.

This shop filled with oddities and knick-knacks is named for a 19th-century charlatan.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

The largest clock face in the United States is twice the size of Big Ben and infinitely more ad-sponsored.

This permanent exhibition celebrates the finest of our heartless automatons both real and fictional.

This shale formation along the Appalachian Trail once inspired the third president of the United States.

A piece of outsider public art accompanied by a strange urban legend.

Under a playground is a little-known sealed train tunnel that likely contains the bodies of workers trapped by cave-ins.

This nine-story building can be played like an instrument.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.

The hidden offices underneath Memorial Bridge have been locked up since 1976.

A surprising, but overlooked example of geology in the middle of the nation’s capital.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

America's first nuclear-powered merchant ship is now a time warp to the atomic age.

The world's second-longest burning light bulb.

A replica of where the Last Supper was held.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

Once America's tallest structure, now a Baltimore landmark.

A priceless collection of the Nation's cryptologic history.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

Remnants of a storybook amusement park hidden behind a strip mall.