New evidence may explain a mysterious encounter in the Bermuda Triangle.

New discoveries might explain the disappearance of 306 Navy crewmen.

Experts try to explain mysterious lights and orbs that are often sighted.

A new lead might finally solve the strange disappearance of the Witchcraft.

Experts turn up new evidence to explain why sailors and crewmen vanish.

Experts search for a sea monster reported to live in underwater caves.

Experts investigate a wreckage that might be a long-lost ship.

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.

Test pilots and engineers embark on the first flight of the largest airplane ever built: the Stratolaunch, a one-of-a-kind aircraft designed to transport rockets, spacecraft and experimental hypersonic planes into the stratosphere.

Engineers in China are constructing the largest and most ambitious water transfer project in human history, defying nature to move vast quantities of water from the south to the dry north in Beijing, all without the use of pumping stations.

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

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

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

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