Explore three battlefield behemoths that command land, sea and air.

Inside access shows how an engineering marvel lifts boats to new heights.

Experts imagine how Washington, DC would look if it were rebuilt today.

The Pantheon is a 2,000-year-old temple with a dark secret. Today, using cutting-edge archaeological methods and brand-new evidence, experts look beneath the streets of Rome to find out why it was built and how it survived so long.

Experts investigate myths of a secret portal to hell in Hierapolis.

Experts travel inside ancient mounds to investigate the legend of Midas.

Discover why the world's strangest disaster zones were built and abandoned.

New discoveries reveal what really happened in a remote Louisiana swamp.

New discoveries reveal what really happened on the shores of Lake Michigan.

New discoveries reveal why an island with a dark past was built.

Experts reveal the sinister purpose of a strange bunker in Florida.

A castle was the site of horrific murders perpetrated by a countess.

Experts reveal the role towers in Greece played during violent feuds.

Experts reveal why a massive, alien-like fortress was built.

An abandoned prison has evidence of a chaotic riot.

An eerie set of buildings in Paris is evidence of an unspeakable evil.