While you wait to cross the street at a traffic light in Mainz, you might notice that the light is staring back at you.

A historic casino where Dostoyevsky is said to have lost it all on a single spin of the roulette wheel.

This tremendous timepiece was once the largest cuckoo clock in the world.

A series of markers along one side of an Amsterdam canal memorialize the Jewish residents from the other side who died in the Holocaust.

This museum tells the story of lake dwellers from 4000 BC to 850 BC, replete with stilt houses and goats.

Enter the cabin of a life-sized Hindenburg replica.

A lakeside footbridge that records Nobel Prize laureates' names in metal silhouette.

A university observatory dome painted to resemble the beloved 'Star Wars' droid.

A former ironworks that was the first UNESCO industrial site.

A meteorite-bounded town in Bavaria.

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

A tree meticulously shaped and trimmed into the shape of an elephant.

In a quiet neighborhood in the south of Berlin is one of the most ambitious social housing experiments of the 20th century.

Sitting at the intersection of sustainability and street art, these repurposed wind turbine blades offer a colorful, "blade-made" tribute to circular design and LGBTQI+ pride in the heart of Rotterdam.

This tiny German village has staked claim to being the center of the union following Brexit.

This outdoor library provides around-the-clock access to around 7,000 books.

A remnant of the Franco-Prussian War, lodged in the city's walls.

An ancient monastery, a locked room, and a mysterious book heist.

An important message and optimistic splash of color in a troubled neighborhood.

Two unremarkable-looking rocks on a cobblestone street are actually ancient wanderers; one a 150-million-year-old limestone, the other a 1.8-billion-year-old granite.

An early 20th-century school building whose clock tower and carved symbols quietly tell the story of the trades once taught inside.

Explore the five senses depicted on this protruding Gothic window.

Stuffed people arranged in unsettling scenes give a voyeuristic glimpse of life within a historic old hotel.