A strange mark in the stone fence of a cemetery fabled to have been made by the Devil himself.

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.

A historic neighborhood church is reborn as a psychedelic arts collective.

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

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

This grand gothic brewery has been pumping out suds for over a hundred years.

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

Home to items never before seen by the public.

When in Idaho, sleep in a giant potato.

The oldest operating Mississippi River–style steamboat still navigates the Ohio River.

This boulder stays on its mountain thanks to a huge chain and on the map due to local legend.

Eight rare Corvettes are swallowed up by a sinkhole in Kentucky's National Corvette Museum.

An abandoned theme park with a strange and tumultuous past.

The world's longest known cave system.

Prehistoric animals decorate this popular outdoor park.

One of the oldest anatomical theaters in the U.S. still in use was once the site of an infamous cadaver riot.

A model home in the Medical Examiner's Office in which grisly death scenes are staged to train forensic investigators.

A hidden alley in urban Baltimore is a haven for graffiti artists.

This free, take-a-book shop seems like a trick but isn't.

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

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

The largest self-built castle in the U.S., six decades in the making.