Cornish legend says these ancient circles were people turned to stone for playing hurling on a Sunday.

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

A fantastic castle rumored to be the birthplace of King Arthur.

A whimsical cottage from the 1300s with a preserved Victorian-era post office inside.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

Hindu temple of the dead home to hundreds of long-tailed macaques.

Sacred waters rescued from the wrath of a volcano.

A fearsome dragon clings to a corner of Munich's city hall.

The "beautiful" equation predicting the movement of all electromagnetic particles is engraved in front of Newton's tomb.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

The bombed out remains of the old church were kept intact next to the new one, as a reminder of the futility of war.

A tiny, heartwarming piece of art hiding in plain sight.

A tiny, hidden alleyway dedicated to the father of meteorology.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

The Great Fire of London and the regulation of one-way streets both started in this alley.

The commemorative stone column conceals a secret laboratory.

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.