Byzantine emperors ruled, lived, and died in this 13th-century palace-turned-museum.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

The second-longest continuous wall on the planet protects a hidden secret in the deserts of India.

Every spring, locals see the shadowy figures of a ghost army of slain Greek soldiers descend upon this ruined fort.

This open air archeological site houses almost as much wildlife as it does classical religious artifacts.

This field of half-buried stone crosses was the burial place of a sect of heretical gnostics.

One of the largest single-span stone-arch bridges in the Balkans looks like something straight out of a fairytale.

The ruins of this monumental city founded by the first Roman Emperor are strangely overlooked by most travelers.

Local lore says two enemy dragons live within these breathtaking mountain lakes.

Six tiny houses built for working class people form the largest intentional cluster of Wright homes anywhere.

Replicas of Apollo's leonine stone guard cats still line a sacred row in Greece.

According to myth, Zeus himself was hidden in this cave to escape being eaten by his dad.

Giant marble phalluses on the sacred island of antiquity.

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

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

This ancient hydrological marvel is now the base of a modern outdoor cinema.

Scars of this building's past life as a violent prison still cover its walls.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

A reconstructed farm shows what life was like in Norway 1,500 years ago.