"X" marks the spot of an echo chamber in the middle of a plaza.

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

Electrical pylon in the shape of Disney's beloved mouse.

A real flying saucer, contracted by the U.S. Air Force.

Take a drunken tour inside the world's largest known geode.

Every equinox this Maya pyramid puts on a spooky ancient light show.

The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.

A monument celebrating the idea of reaching inaccessible places.

Rabbit Hash is a heaping slice of Americana from another era, with a very peculiar origin behind its unusual name.

Moonbows over Kentucky.

The world's longest known cave system.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

Enormous lake at the bottom of a unique cave system.

A bizarre roadside attraction and the first instance of miniature golf in the world.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world’s largest coastal brick fortresses.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

"We Seceded Where Others Failed."

A tribute to Ponce de Leon's supposed quest for eternal youth.

The largest earthwork effigy in the world.

A castle built by an eccentric medieval enthusiast in suburban Ohio.