A building facade covered with the statues of 11 giants of Tajik literature.

The bronzed skull of a beheaded traitor was affixed to the city gate in the 17th century.

Local lore says a serpent-like beast lurks in the deep basin below the falls.

A spiritual sanctuary in a natural cave.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

The final resting place of the controversial chess champion.

The romantic botanic tunnel feels like a well-kept secret.

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

There's a labyrinth of medieval chambers hidden deep below a 15th-century pub.

A dreamy mausoleum honors Persia's most famous poet.

Stunning ruins of what was once the center of one of the greatest empires in East Africa.

The weathered grave of a medieval anchoress who walled herself up in a cell attached to a church.

This headstone-like marker inscribed with three words has been an utter mystery for over a century.

A remarkably well preserved tower dating all the way back to the Iron Age.

Colorful lights and mirror-like brine pools create trippy illusions within the historic mine.

One of the greatest heroes of the Titanic tragedy came from humble beginnings to this beautiful home.

The world's newest astronomical clock is also its most accurate.

The steepest classic funicular in the world glides along a dizzying incline.

A kitschy Italian medieval-style castle incongruously located amidst one of the most historic towns in the Peruvian Amazon.

The Victorian-era greenhouse is stuffed with tropical plants, and open 365 days a year.

The oldest and smallest cemetery in Paris is only open to the public twice a year.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

The remains of a doomed Antarctic plane, buried beneath layers of ice and snow, await those willing to do a bit of digging.

This remarkable prehistoric town is full of watchtowers and houses that have withstood thousands of years.