The coliseums of Rome were brutal theaters of spectacle and death that helped control the sprawling Roman empire; now, archaeologists uncover the engineering secrets behind these majestic structures to reveal the truth behind the ancient Roman world.

Experts reveal the secrets of the Persian Empire's capital, Persepolis.

Experts investigate an ancient temple monument on an Egyptian island.

Experts reveal the mystery behind the decapitated statues of Mount Nemrut.

Experts use cutting-edge tech to unlock the secrets of Tintagel Castle.

The ancient city of Samarra contains a series of medieval structures that hold secrets to one of the world's greatest empires; now, archaeologists use pioneering technology to investigate its astonishing rise to power and reveal its monumental downfall.

Experts investigate the truth behind the mythical city of Xanadu.

Experts investigate secrets behind the ancient Egyptian city of Abydos.

The downfall of the powerful Maya city of Palenque in southern Mexico continues to mystify archaeologists today; now, investigators gain rare access to explore lost tombs to reveal the truth behind this legendary city and the mystery behind its enigmatic queens.

The ancient Sumerian city of Nippur is one of the richest archaeological sites on Earth, but decades of conflict have prevented its exploration; now, experts gain rare access to finally uncover the mysteries behind the most sacred city of Mesopotamia.

The Valley of the Queens is a vast necropolis concealing some of Egypt's most miraculous tombs and powerful women; now, investigators use cutting-edge tech to explore lost tunnels and uncover the enigmatic secrets behind these ancient pharaohs.