The unusual patterns in this rock formation result from two distinct modes of weathering.

A tunnel with windows, so you don't miss out on the impressive views.

Nevada's largest cactus collection stands outside a candy mogul's small factory.

This former shopping outlet is now adorned with beautiful graffiti and murals.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.

The arch that celebrated the completion of the Lincoln and Victory highways.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

The largest permanent Monopoly board makes one of the longest games even bigger.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The unbelievably opulent home built for an infamous newspaperman.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

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

Once featuring over 60 miniature replicas of famous Chinese locations, the Splendid China theme park was completely abandoned and is now mostly rubble.

After the attack on Pearl Harbor, rocks and fossils from every U.S. state were collected into a pyramid of national unity.

One of the richest places in the United States has a cursed street.

A Looff creation in Santa Monica best described as “a California-Byzantine-Moorish-style fantasy.”

This beachside town is home to a diverse nature reserve, multiple cays, and one of the three bioluminescent bays in Puerto Rico.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

This colorful gate stands as an entrance to the walled city of Old San Juan.

Invading U.S. troops were first seen from this now-abandoned tower, leading to the Spanish-American War.

Puerto Rico's once thriving oil company is now an abandoned wonderland of rusty steel.

La Cara del Indio honors the Taíno chief who fought bravely against the Spanish invasion of Puerto Rico.

The world's second largest single-dish radio telescope, once used to contact E.T.