The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

An alley covered with 20 years of bubble gum.

In the Shawnee National Forest, amazing rock formations peer through the treeline.

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

An enormous natural sandstone bridge in Kentucky.

A historic Masonic building overlooking the Puget Sound.

A picturesque example of brute-force engineering conquering nature.

A showcase of engineering might that was also symbolic of westward expansion.

A unique museum where guests can rent and operate a locomotive.

Come for the speed, leave in love with the desert.

A 90-foot-tall psychedelic "tree" on the side of the highway has baffled passersby for decades.

A towering tribute to decisiveness stands on the spot where Brigham Young and his followers decided that this must be the place.

A house carved into a rock in the 1940s.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

A time-capsule monument reminding future generations of the importance of efficient and effective use of natural resources.

The fifth tallest statue in the United States is a shirtless monument to the oil worker.

A 35-foot-tall fork stuck in the ground outside an office building in Missouri.

Where the author wrote her beloved "Little House" books.

An unfinished rail tunnel that has since been used to house cheese and bats.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

A collection of outdoor art by renowned muralist Robert Dafford depicts the history of a flooded city.

You have to love a museum with a truly dedicated focus. A focus on Superman, for example.

Planes, trains, and automobiles have all been sunk as attractions at this Illinois diving spot.