This Roman amphitheater is said to be King Arthur's legendary Round Table.

A stone copper was sculpted on the wall of the Carlisle Cathedral to honor a local hero.

Also known as “Robin Hood’s tree,” it became a famed location along Hadrian's Wall before it was cut down.

This temple was constructed entirely by Roman soldiers.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

On October 17, 1814, a 15-ft. wave of beer ran rampant through the streets of London.

The Tudor-style cottage in the middle of the square is not quite what it seems.

An oddity of a bygone era that stills functions today.

Despite the name, this ancient piece of crystal may not have been a lens at all.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

This former luxury resort in Kaua'i is now an abandoned relic.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

The air force base preserves its scars from the Japanese attack on Pearl Harbor.

A glass display case holds the document that ended the Second World War—which one person signed on the wrong line.

An ancient octagonal weather station named for the eight Greek gods of wind.

Legend says this sacred tree was a gift from goddess Athena.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

This legendary city has been a tourist attraction for centuries.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

This stone tower was built to protect Crete from incoming pirates.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

One of the greatest collections of coins in the world is housed in the former mansion of an archeological pioneer.