One of the highest emergency huts in the world has been waiting almost a century to give imperiled climbers a place to lie down.

The train platform where Jews were sent to concentration camps is now preserved as a Holocaust memorial.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

One of the world's most advanced radio observatories sprawls across the Atacama Desert.

A surprisingly detailed model of the world's most powerful radio telescope.

Formerly a brutal Nazi colony, this Chilean village was remade as a (controversial) German-themed tourist trap.

A brutalist gem towering over the heart of Milan.

This Bordeaux parking garage has 712 indoor spaces, and one outdoor.

The world's largest reflecting pool is just two centimeters deep.

Lady Liberty's original designer installed a little clone in this French fountain.

The portrait of a man from Japan who sent weekly letters to a Dutch hotel he never visited.

The wreckage of a tragic plane crash is on display at this museum devoted to a famous Italian conspiracy.

The remains of an ancient Roman city are hidden underneath Bologna's beautiful public library.

This bridge's unique architecture honors nautical heritage and encourages self-awareness.

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

The last of Amsterdam's original sea level markers remaining in place.

This museum inside Amsterdam's largest cemetery explores how people deal with death.

A solid steel plane designed to catch fire over and over again.

This former steel and coal plant is now a neon-lit industrial fantasia.

The largest mosque in Germany.

This unique sculpture proved invaluable when it saved a train from careening off the tracks.

A condensed piece of China floating in a Dutch harbor.

This colorfully-painted tunnel links two distinct parts of a historic neighborhood.

A nuclear reactor created for Eisenhower's "Atoms for Peace" campaign is now used for research at a Dutch university.