Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

An ancient Greek monument and a Byzantine church coexist inside this cave.

Legend says this sacred tree was a gift from goddess Athena.

Legend says it was constructed with the destroyed pillar of an ancient Greek Temple.

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

This probably wasn't what Mao had in mind.

An ancient fortification lives on in this Chinese city.

Deliberately hidden for centuries, the magnificent Saadian Tombs were eventually uncovered in 1917.

The oldest known university in the world is in Fez, Morocco.

Traditional 11th-century outdoor tannery.

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

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

The other side is actually green.

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

A full-size replica of this well-preserved temple lets you take a walk through the Mayan age.

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

These roaring primates were considered a divine creature in the cosmology of the Maya.

Monkeys inhabit the lush forest surrounding ancient Mayan ruins once considered sacred.

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

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

A steampunk airship "floats" above Hamilton Gardens delivering plants and compost.

The "Rocky Horror Picture Show" character has a hidden camera that broadcasts people doing the "Time Warp."