Vicky Matthews

Scientists investigate the possibility that alien life-forms influenced human evolution, citing the existence of strange monuments around the world to support their theory.

Experts examine the ruins and relics hidden under London. Among them, a Roman amphitheater, ditches for victims of the black plague, bomb shelters and more.

Andrew Carnegie: Rags to Riches, Power to Peace charts the story of a poor Scottish immigrant who sailed to America in the 1840s, and by the end of the century would be the richest man in the world.

On April 10, 1912, the RMS Titanic embarked on its maiden voyage, sailing from Southampton, England, to New York City. One of the largest and most luxurious passenger liners at the time, the Titanic was also equipped with watertight compartments, which led many to consider the ship unsinkable; an anonymous deckhand famously claimed that “God himself could not sink this ship.” On April 14, however, the ship struck an iceberg, and early the next day it sank. Some 1,500 people perished.

Are the self-sufficient couple how members of the royal family should be?

Known as the setting of "Downton Abbey," Highclere Castle truly was the home of aristocrats and an army of servants, with a rich past to share.

A tour of the Tower of London, which has served as a royal castle, prison, place of execution and torture, armory and mint during its almost 1000 years of existence.