These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.

This chimerical bridge/tunnel appears to dead end right into the sea.

Bridge that died in war and was resurected.

Less a museum than a bizarre fantasy world created by artists and engineers.

This is not your typical jungle gym.

The Magic House provides a beautiful and creative environment for curious youngsters to get their knowledge on.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

An extraordinary library and archive dedicated to the history of the Arctic and Antarctic poles.

An intriguing three-sided folly is a testament to one man's devotion to Catholicism and the number three.

One of the oldest libraries in England, and one of the last of the great medieval chained collections.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

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

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Medicinal spa created with the discharge from a geothermal energy plant.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

Northern Ireland's Brobdingnagian stepping stones.

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

Museum celebrating the history of computers, especially their role in codebreaking.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The patron saint of spinsters grasps a container of dried blood.