This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A marvel of Byzantine engineering under the streets of Istanbul.

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

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

Gladiators once walked this ancient, subterranean passage.

These caves secretly held national treasures during World War II.

A man's head is enshrined beneath a statue near the first building constructed for the modern Olympic Games.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

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

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

An ancient octagonal weather station named for the eight Greek gods of wind.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

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

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

A 1,000-year-old church holds the bones of the Christian martyrs who died hiding inside it.

This breathtaking monastery was established by Saint Benedict himself 1,500 years ago.

What looks like a link in Gondor's early warning system is actually a centuries-old Italian fortress.

A medieval stronghold rising over the ruins of ancient Roman villas along Rome's southern coast.

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

Breathtaking and huge 430 year old maps of Italy.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

The final resting place of the poets Shelley and Keats.

Romans decided this 16th-century "talking statue" was so ugly, they named it after a primate.