This short bridge is the only thing connecting a tiny Irish island to the mainland.

Northern Ireland's Brobdingnagian stepping stones.

Behemoth, cannon-like telescope operated by generations of Irish earls.

A gated cross stands on the site where an Irish revolutionary met his end.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

It houses the remains of a 17th-century version of the Titanic.

Climb inside an iron crystal magnified 165 billion times its normal size.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

Now overlooking the Home of the British Army, this gargantuan statue was removed from its original location in London.

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

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

Home to Alan Turing, the cracking of the Enigma code, and Captain Ridley's shooting party.

The site of the most dived wreck in the UK.

Putting the "mod" in "modular" since 2000.

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

This memorial to the thousands of Indian dead during WWI was callously used for target practice during WWII.

This striking steel sculpture transforms environmental data into art.

A bronze sculpture of last Sikh maharaja of the Punjab, outside the English estate where he once lived.

Long before wi-fi, this public seat provided the wonder of being online while outdoors.

A hill carving of the legendary dragon that terrorized the village of Bures in the Middle Ages.

It's believed emperor Hadrian himself funded this once architectural wonder.

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

A chaotic collection of coin-operated slot machines designed to delight and disturb in equal measure.