These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

The bronze uniforms commemorate the vital role of women during World War II.

A haunting monument dedicated to the Royal Naval Air Service and the Fleet Air Arm.

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.

Sculptor Antony Gormley used chaos theory and fractal growth to design his tallest creation.

The handiwork of a underdog clockmaker who solved an impossible problem for an Empire, and forever revolutionized seafaring.

A Victorian park cemetery, standing on the site of what was once the Great North Wood.

"We gonna rock down to Electric Avenue, and then we'll take it higher..."

A fully functional, 200-year-old remnant of the time when Brixton was mostly fields.

What started as a way to address damp basement walls turned into a house filled with intricate hand-carved designs.

Legends say that this Art Deco apartment building almost became Hitler's British headquarters.

These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

Cliffs full of fossils at the portal to England's Jurassic Coast.

A circle stone within a stone circle.

A neolithic dolmen that was rebuilt after collapsing during the 19th century.

Perhaps the only prehistoric monument with its very own public bus stop.

A open air theatre built on a cliff by an eccentric British woman.

This former quarry is now a vibrant labyrinth of magical in situ sculptures.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

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

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

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.