It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

Amsterdam's former hotspot for public executions and dissections.

The Bloemen Route, or “Flower Route”, stretches 25 miles through prime Dutch tulip country as a result of “tulip mania,” the world’s first economic bubble.

A beautiful maze marks where three countries meet.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

This unattributed sculpture in Amsterdam is hiding in plain sight.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

A six-ton wedding present for the King of the Scots.

A close look reveals that the Scottish monument is just slightly off-kilter.

These ruins witnessed the final gathering of the failed Jacobite Rebellion.

Scotland's only funicular railway is also the United Kingdom's highest.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

A sweet symbol marks the place where torturous executions were once carried out.

Largest lake in Great Britain measured by surface area.

Legend says a witch conjured the world's third largest whirlpool to protect Scotland from a nasty pirate.

Britain's only herd of free-ranging reindeer.

The "dragon babies" of southeastern Europe.