This 1920s Amsterdam neighborhood was built as a giant experiment in concrete construction.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

One of the great treasures of Neolithic art lies within this carefully constructed pile of rocks.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

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

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

This snug medieval lane is one of the narrowest streets in the world.

This automated sculpture of two men peeing will spell out text messages with their micturition.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

What looks like a suicide in progress is actually a statue of Sigmund Freud.

Walk through Czech history in Prague's largest graveyard.

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

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

A stately palace has been converted into the world's largest cannabis museum.

Mountain where Jesus was first tempted by the Devil.

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

A beautiful but toxic fountain of mercury.

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

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