Iceland's tribute to its thankless civil servants.

The first tunnel to be dug beneath a river, repurposed as an art and museum space.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

This early version of the guillotine was used to execute the man responsible for its construction.

The most loyal of little dogs, or a Victorian era publicity stunt?

A sweet symbol marks the place where torturous executions were once carried out.

The patch of land below the memorial was gifted by the British to the United States.

The scene of the United Kingdom's most famous UFO incident, dubbed the "British Roswell."

The English Civil War began right here in 1642.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

This two-towered gateway is all that remains of the unluckiest pier in the world.

One of the few surviving street funiculars in the world.

These abandoned coal mine towers near Sherwood Forest might soon boast the U.K.’s longest zip-line.

Some of England's last cave dwellers lived and worked within this huge cave.

Modern commuters still pass through this 2,000-year-old Roman archway.

The ship built to ferry passengers and goods to the doomed Titanic is now the last remaining White Star Line vessel.

An avant-garde artist is survived by his seaside garden.

The highest peak in Northern Ireland is topped with a stone tower and haunting burial mounds.

This chain of artificial lakes was an ideal test ground for the aircraft that would carry the "bouncing bombs" used by the WWII "Dambusters" squad.

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

The highest peak in all of England is plagued by dangerously fickle climate shifts.

This fantastical and eclectic English garden takes its inspiration from Egypt, China, the occult and more.

Semi-precious Blue John stones have been mined in this cavern system for centuries.

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