A "time traveler's" vision of human history stretches throughout Mexico City's Copilco metro station.

A series of modernist, abstract sculptures form a route created as part of the 1968 Olympics' Cultural Olympiad.

A series of abstract sculptures pop up from an otherworldly volcanic landscape.

The extremely grey columns of one of Mexico City's most iconic beltways are slowly gaining a bit of color.

Known as the "Finger of God," a dramatic rock formation resembles a divine hand extending towards the heavens.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

Commonly acknowledged as the only public monument to the Devil himself.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

A significant example of Czech cubist architecture—a style you won't find anywhere else in the world.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

This automated sculpture of two men peeing will spell out text messages with their micturition.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

What looks like a suicide in progress is actually a statue of Sigmund Freud.

The holes in this wall provide a glimpse into Jewish life in Budapest, both past and present.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

At least according to the Guinness World Records.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

A series of playful yellow penguins share a serious message about the environment.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

Macabre astrological automaton clock dating to the late 1400s.