A fantastic castle rumored to be the birthplace of King Arthur.

A memorial to the British politician who spearheaded the National Health Service.

The enormous earthwork sculpture honors the ponies that lived and worked in the old colliery.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

An abandoned 1970s theme park that has been turned into a space for waterfront walking.

A fantastic place to see murals, and an important location in the history of Toronto's legal street art scene.

This former Welsh metal factory is now a lovely abandoned relic but was once one of the industry's world leaders.

Macabre astrological automaton clock dating to the late 1400s.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The painting on an aptly named street honors the 1980s slasher movie.

A real-life Professor Snape once taught in this Welsh university building, which students of course nicknamed “Hogwarts.”

Breathtaking and huge 430 year old maps of Italy.

Pompeii's less famous neighbor is still revealing her secrets.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This innovative steam machine was no doubt the most famous of the pioneer locomotives.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

An open air haven for tropical monkeys in the damp moors of the English country.

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.

One of three sites in England that house the National Collection of Arms and Armour.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.