Constructed by forced laborers, this submarine pen is now a museum and war memorial.

A spitting ode to a German serial killer.

Böttcherstraße's bells, extolling Nordic virtues and the great conquerors of the world.

This unique Renaissance castle was turned into a home for Nazi occultism.

A fearsome dragon clings to a corner of Munich's city hall.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

This 600-year-old home seems to defy physics.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

This tribute to the 16th-century composer is now an unusual shrine to Michael Jackson.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

A small but immensely extravagant palace built by the "Night King."

This monument to those fallen in the World Wars is accompanied by a U-boat that Germany bought for a Deutsche Mark.

On the highest peak in the Harz Mountains, science and the occult faced off in a failed attempt to turn a goat into a boy.

Albert Einstein's head sticks out of a snail shell stacked on a rocket in this truly bizarre monument to the scientist.

A typical crusty old museum this isn't.

In this brilliant blue spring in Germany, legend has it that a sad mermaid learned to finally laugh.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

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.

Amsterdam's former hotspot for public executions and dissections.

A public urinal so pretty, it was declared a national monument.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

The final resting place of the liberator of Argentina is guarded around the clock by two soldiers.

The humble tomb of an Argentine general, hand-built by his son using stones brought down from the Andes.

These small sculptures pay homage to the lovable star of an iconic Argentine comic strip.