This 15th-century island fortress later served as home to the executioners no one wanted to live near.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

The hallucinogenic center of the ancient world.

Monasteries on rock pillars, once accessible only by frayed ropes.

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

Every equinox this Maya pyramid puts on a spooky ancient light show.

The stoutest tree in the world.

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

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

Centuries before the modern seismograph, Armenian monks measured quakes with this tilting pillar.

An ancient capital city that dates back 3,000 years old and harbors many surprises.