An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

Faces carved into the cliffs create an otherworldly walking trail.

It would take 35 firetrucks to fill this enormous glacial pothole.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

The wooded estate of the Forest Service employee responsible for D.C.’s cherry blossom trees.

On a wall in Cleveland, Ohio find the story of a highly connected fictional community of organisms that created remarkable, lasting structures.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

305 homemade stone stairs wind their way up the Hamilton escarpment.

The ruins of the suspension bridge hang over Kingsbury Run as a ghost of racial prejudice.

This massive swimming pool is the high tech home to the human-powered submarine races.

Exact replica of the ancient monument, but much, much lighter.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

A faded sign from the 1920s remembers Baltimore's resistance toward banning alcohol.

A museum dedicated to exhibiting remarkable outsider art.

Fiji mermaids, mummified remains, and recreated cryptids are among the morbid oddities at this Maryland museum.

Ghost stories surrounded this “castle,” the only structure from a huge mansion that was never built.

Ohio's 19th-century communist micro-society.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

A field of nothing but boulders which resembles a giant's gravel driveway.

An eccentric company offers eccentric millionaires the opportunity to have spaceflight-related experiences.

This oversize piece of novelty cookware once cooked the largest pancake in the world.

One man's real life disfigurement inspired a lasting local legend surrounding an eerie tunnel.

First a root beer ad, then a golf course clubhouse, and finally a massive teapot.