The ruins of an 11th-century Norman castle with a rare, perfectly circular shape.

After years of slow decline, a derelict Gothic castle is now being restored to life.

A moody and picturesque riverside ruin overgrown with vegetation.

Crumbling pyramids and temple ruins stand within the shadow of this sacred butte.

This ancient altar emerges from the thick forests to reveal the mysteries of Etruscan sacrificial rituals.

These delicate sand pyramids look like naturally occurring gothic spires.

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

This staircase full of Mayan hieroglyphics is perhaps the largest single text in the world.

Deep in the Guatemalan jungle stands an ancient pyramid that once marked the reign of a king.

One of the world's largest pyramids stands within El Mirador, the "lost city of the Maya."

This partially reconstructed Aztec pyramid gives a glimpse of what its larger counterparts would have looked like.

The jewel of western Mexico's archaeological legacy is this tiered circular pyramid now covered in grass.

Cool down and fill up after visiting Teotihuacán at this bar and restaurant in a deep, underground cave.

The ruins of an ancient pyramid built by the mysterious Chupícuaro civilization.

Some claim these desert ruins are from the legendary "Atlantis of the Sands."

This lonely tomb is all that remains of a once-bustling ancient trade hub visited by Marco Polo.

This lost city belongs to one of the earliest civilizations in the world.

The ruins of an ancient island city built atop a coral reef in the South Pacific are spectacular and strange enough to have inspired H.P. Lovecraft.

This legendary city has been a tourist attraction for centuries.

Mysterious tombstones thought to be remnants of Atlantis.

This stone complex marks the urban center of a lost civilization.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

The singular ruins of a mysterious lost city.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.