The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

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

This historic little railroad runs through some of the most beautiful scenery in Germany.

The sweet story of how American cargo planes became known as "Candy Bombers" during the Berlin Blockade.

From Nazi chemicals to the CIA, this architectural marvel has played a fascinating role in German history.

The first recognized Neanderthal remains were found in this now-lost cave in 1856.

Built to test magnetically levitated elevators, the tower also boasts Germany's highest visitor platform.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

A tiny island is connected to the mainland by a private railway that residents travel in their own personal wagons.

This cobblestoned medieval-style town was entirely constructed in the 1990s and 2000s.

This strange building looks like a medieval fortress crashed into a 1960s Brutalist office block.

The Netherlands is home to a bridge printed out of reinforced concrete.

The world's first and only three-segment bascule bridge folds up into the shape of a capital "N" to let boat traffic through.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

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

Largest illuminated advertisement sign in the world.

World's only telecommunication tower with a wooden pinnacle.

Germany's last remaining Lenin statue has become a lightning rod of debate about the country's divided past.

There are two dozen tanks just sitting in an open field in Lower Saxony.

This futuristic German television spire is actually the world's largest digital clock.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

The NASA scientists behind Apollo 11 started out developing Nazi weapons at this abandoned German rocket factory.

The narrowest street in the world is in danger of closing up entirely.

This painted Lego bridge is the product of over a century of locomotive history.