Though this large circular site is now named for the legendary king, its history dates back to the Neolithic era.

The Stonehenge of Wales is one of the grandest neolithic dolmens still in existence.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

An architectural oddity hides in plain sight on this iconic London bridge.

Two plaques commemorate the site of Shakespeare's first theatre.

These strange large stones served as a campsite and lookout post for generations of Native Americans.

Giant instrument-shaped home in Fayetteville, Georgia.

How did a 154-foot-long piece of spacecraft wind up abandoned along the side of a Florida road?

A sprawling maze of used books piled from floor to ceiling.

A monolith replica monument of Jean Ribault commemorating the landing of the French in the New World.

Established in 1890, this Jacksonville institution is the longest running music venue in the state of Florida.

Ch-Ch-Check out the world's largest hand-painted 3D mural.

In the late 1990s, a mechanic and fan bought this iconic sportscar back from the dead.

The ruins of this antebellum sugar plantation are the end result of a Seminole attack during the Florida Wars of 1836.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

The most powerful waterfall in all of Europe.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

This collection features more than 240 antiquarian maps from around the world, in addition to historical views and plates focusing on North Florida.

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.