A memorial for a young woman and her ghost, which are claimed to have caused countless deathly shipwrecks.

No need to strap in for a “ride” on this walkable roller coaster.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

An astonishingly accurate water clock that doubles as an hourly spectacle in this Berlin shopping area.

Art installations, derelict railcars, and endangered grasshoppers all call this south Berlin park home.

Metro station with a claim to rock n' roll fame.

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

Remnants of the Nazis' occupation of Denmark linger along the sand.

A Danish fisherman spent 25 years covering nearly every inch of his home with tens of thousands of shells as a gift to his wife.

Nearly 40 miles and 1,000 years of limestone mines under Denmark.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Experience a charming 1930s version of "infotainment."

A 1:20 scale piece of the Netherlands commissioned by a queen lets visitors take a stroll as giants.

The struggle of a small Dutch island against the sea.

A fantastic castle rumored to be the birthplace of King Arthur.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

The largest greenhouse in the world is home to over one million types of plants.

England's most notorious suicide spot.