A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

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

Northern Ireland's Brobdingnagian stepping stones.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

Though considered an eyesore by some, this boxy Brutalist high-rise plays a significant role in Sydney's past.

Come for the flowers, stay for the bats!

Nine limestone rock stacks on Australia's "Shipwreck Coast."

The ruins of a once prosperous power station have become a mouldering seaside gem.

Visible from both land and sea.

Alien rock formations grown from the sands of an Australian national park.

A massive concentration of algae is responsible for this lake's pink hue.

Living fossils in this remote Australian bay provide a glimpse of what Earth may have looked like 3.5 billion years ago.

This Australian beach is composed of tiny shells.

Twice a day this ancient path disappears with the tides, leaving the Holy Island of Lindisfarne out to sea.

The medieval-looking hammer beam teak roof may be a Victorian vanity, but it's still absolutely magnificent.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

The sign at the garden gate reads: “These Plants Can Kill.”

A million and a half tons of earth were used to create one of the world's largest land sculptures.

This gorgeous space is England's largest independent library outside of London.

This century-old grotesque has a mysterious history and may not actually be a rabbit.

This memorial honors the first British soldier killed by enemy action on home soil during World War I.

The legend of a monkey that was hanged as a spy has inspired not only a football team name, but a successful mayoral campaign.