At night, this memorial illuminates a ghostly outline of a footbridge that connected two sections of the Warsaw Ghetto.

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

A poignant museum dedicated to the history of the Dutch resistance against Nazi occupation

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

This cheese shop also houses a museum devoted to Dutch dairy.

The history and future of cannabis.

A floating cat sanctuary on an Amsterdam canal.

The world's only museum devoted to the wonders of fluorescence.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

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

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

A visionary precursor to the Internet made of index cards.

An early 20th-century sanatorium, long abandoned and now being reclaimed by nature.

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

Inside this former medieval prison is a collection of objects designed to inflict unbelievable pain and suffering on the human body and mind.

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

This bike path traverses the treetops.

The "stairway to heaven" lookout tower was built to resist weather, arson, and the laws of physics.

In an area where the remnants of WWI are discovered on a regular basis this preserved frontline trench may be the most amazing.

This bike path was sunk below water level for maximum wonder.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

One of the deepest indoor swimming pools in the world.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

This modern arts center is built around a gem of late-Baroque architecture.