These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

In Coyoacán, a pair of coyotes crown a public fountain in reference to the ancient Aztec name of the borough.

Frida Kahlo's childhood home, now a museum of her life and works.

This exquisite example of early colonial architecture remains unfinished almost 500 years after construction began.

These sacred Mesoamerican ruins feature peculiar petroglyphs hidden in the stones.

Southern Italy's spinning top village.

Three underground crypts and a pointed arch under the bell tower make this cathedral unique among Romanesque churches.

A dead saint, a deadly poison, and a mysterious holy ooze.

A crumbling watchtower and a lighthouse overlooks the site believed to be the Sirens' cliff in the "Odyssey."

This clifftop arch is a natural stunner.

A 12th-century Italian skirmish gets reenacted with 500,000 pounds of flying citrus.

When this funny little building went up in the 19th century, most people thought it would simply fall over.

A fake medieval village in the middle of Turin.

One of the oldest and most significant collections of Ancient Egyptian archeology outside of Egypt.

This building has a giant piercing through one of its corners.

This fountain is dedicated to the workers who perished constructing the Fréjus Rail Tunnel.

This mountain trail inspired Nietzsche to complete his magnum opus.

A fortress on this island housed the mysterious prisoner known as the "Man in the Iron Mask" for more than a decade.

This massive blockhead sculpture hides an entire library.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

The largest madrasa in Morocco once housed more than 900 students within its exquisite walls.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

The largest whale museum in Europe allows visitors to walk among life-size giants.