Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

Guarded by the Angel of Grief, the Stanford family tomb attracts an odd mix of halloween revelry and somber contemplation.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

The world's longest known cave system.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

The world-record holder for the longest bridge stretching continuously over water.

This pedestrian footbridge honors Pero Jones, an enslaved African who lived in Bristol.

Crafted by one of the first makers of stoneware in England.

This petite cutlery factory sits on the foundations of a defunct gasworks.

This church is said to have connections to the Knights Templars.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

The influential philosopher's old residence is commemorated in a small English town.

Named after a lodging site that existed nearby, a bridge has existed at this location since 1455.

Britain's answer to the NSA is based out of this deliciously-named circular headquarters.

At the height of alum production at this factory, human urine was a valued commodity.

Vast fan-shaped British cemetery honouring American servicemen lost in World War II.

The designer of this railway tunnel added a birthday present for himself.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

Britain’s longest ancient monument, this great 8th century earthwork was built to mark the boundary between what would become England and Wales.

There's a labyrinth of manmade tunnels stretching for over an acre beneath Bristol.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.