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

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

The hidden lair of an alchemist rediscovered in a 2002 flood.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

Water and windows define this defensive Italian well.