A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

This small museum tucked within a subway station holds pieces from Madrid's past.

An ancient Egyptian temple in the middle of Madrid, Spain.

A museum dedicated to the history of the diamond trade in the Netherlands.

The smallest bar in Amsterdam has stayed in the family since 1798.

Amsterdam's former hotspot for public executions and dissections.

This pirate-broadcasting-tower-turned-restaurant played a rebellious role in the history of Dutch television.

Descend into the tunnels to experience the life of a coal miner.

A 14th-century fortified keep showcases the masterpieces of an ingenious 20th-century clockmaker.

A Belgian self-built tower inspired by the Bible and ancient civilizations.

Hiding the longest subterranean river known in the world.

A small statue commemorates a centuries-old event that still hangs over the people of Leuven.

A replica of a 17th-century map of the stars stands in the courtyard of a Belgian university.

Dedicated to the American general whose reply to a German demand for surrender was simply "Nuts!"

Banished from town, this local jester concocted a clever return.

The last Oostende trawler to fish off Iceland is now a museum.

Take a leisurely walk through the park to find the seven giant troll sculptures hidden throughout the park.

A fascinating and enormous collection of natural history exhibits stained by a dark colonial legacy.

A man throwing a giant severed hand towers over Antwerp’s main square.

A moving memorial to the fallen and missing from WWI trenches.

This memorial museum chronicles the apocalyptic destruction of the First World War.

A giant bug impaled on a 75-foot-tall needle.

This whimsical statue dumps water on its head to symbolize knowledge flowing into his brain. Or maybe booze.

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.