Countless grotesque faces stare out from this eerie Prague art wall.

Macabre astrological automaton clock dating to the late 1400s.

A surreal statue honoring Prague's favorite literary son.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

Where the lovelorn find a home for their sentimental keepsakes.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

An American ghost town hides along a side street in Scotland's capital.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

A statue in the heart of Edinburgh honors a bear that served in the Polish military during World War II.

A sweet symbol marks the place where torturous executions were once carried out.

After Christopher Columbus died, his son built a fancy house to rule from.

The oldest colonial fortress in the Americas was once the home and later prison of Christopher Columbus.

Built in 1512, the oldest cathedral in the Americas.

The first official clock in North America, it kept time for the Spanish government of Santo Domingo.

The first hospital in the New World.

This trio of Dominican cave lakes comprise a colorful biosphere of natural life.

Pilgrimage site for star-crossed lovers.

A mysterious ancient elephant said to possess magic powers is now the symbol of a Sicilian city.

This one-time health resort was used by aristocrats around the world.

The "dragon babies" of southeastern Europe.

This abandoned Slovenian military barracks has become a punky-political art squat.

A whimsical bridge adorned with decorative dragons.

A miniature train-ride through Slovenia's largest cave system.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.