Exploring London uncovers the chaotic Victorian period's violence, extreme poverty and lawlessness.

A secret underground transforms Las Vegas from a barren desert into a metropolis.

World War I's trench warfare helped shape Germany's Adolf Hitler.

Subterranean secrets from Europe's Dark Ages.

Underground Los Angeles includes a haven for killer Charles Manson and his followers.

Digging into the secret lives of ancient Roman gladiators.

The rich mythology of gods and men beneath the soil of Turkey.

Australia's past had convicts transported from Britain, gold miners and outlaws.