On the surface, London is a buzzing, modern metropolis--but underneath lies a secret, hidden world. Secrets of Underground London uncovers 2000 years of subterranean history: a world of ancient caves and perfectly preserved Roman remains; mysterious rivers and gruesome plague pits; impenetrable vaults and top-secret bunkers. Dig deep to unearth some of the most extraordinary stories of the darkest side of the city.

Aired: 6/22/2014 | 0:54:41 | Expires: 6/21/2024