This kitsch eatery is chock-a-block with bric-a-brac.

The oldest bar in Missouri is hidden within a limestone brewery cellar more than 50 feet underground.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

The only pig museum in the U.S. holds one of the world's largest collections of pig items.

If there's another drive-through golf-cart bar in a bat-filled cave on top of a mountain, we don't know about it.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

The yawning maw of this pagan visage is said to bite off the hands of liars.

When this 18th-century observatory's meridian was moved, it set Sweden's time back by 0.04 seconds.

Stockholm's narrowest alley is barely over two feet wide.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

Stockholm's deepest subway station is also a stunning ecological wonder.

The world's largest model of our planetary system.

It houses the remains of a 17th-century version of the Titanic.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

This super steep hike ascends 2,000 feet in less than a mile.

The huge collection of paintings of the American West is one of Denver's best-kept secrets.