It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

A unique tribute to the millions of animals who served and died for the British military.

This overlooked street light once served as a KGB dead letter box.

A three-centuries-old crypt in the foothills of an old plantation.

The medieval woodcut-style artwork chronicles life in medieval London.

Situated on a sacred Inca site, this 16th-century cathedral took nearly 100 years to build.

The mysterious "Candelabra of the Andes" could represent anything from a god's trident to a hallucinogenic plant.

The unique collection often goes unnoticed by visitors focused only on the archaeological objects.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

Western Europe's only representation of a Roman goddess still in its original location sits in an unassuming park.

Bioluminescence in the reefs of the Maldives causes the sea to glow like a starry night sky.

At the United Kingdom's only residential library you can sleep among the books.

The worst flood disaster in Welsh history might have been a lot worse if it had not happened on movie night.

These remarkable cascades are the jewels of Upper Tees.

After the band included its number in one of their songs, the box became a monument to the musical group.

Charles Dickens described the concert room in this amazing Victorian hall as "the most perfect room in the world."

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

A rare wooden coffin set vertically into the Gothic arch of an ruined church.

A 168-foot tower, part of the abandoned Chester Leadworks facility.

A mysterious demonic figure peers down from its perch within the gorgeous Chester Cathedral.

Most of Britain's gold reserve was secretly stashed here after the start of World War II.

The grand complex of buildings that comprise Liverpool's Exchange Flags includes a vast World War II bunker that has been frozen in time.

This intriguing Bronze Age artifact spent centuries hidden within a Welsh faerie hill.