The fountain marks the area where hundreds of accused witches were burned at the stake.

360° views of the city plus five floors of optical illusions and hands-on science.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.

These enlarged egg sculptures represent the native birds of eastern Iceland.

Iceland's only steampunk shop imagines a retro-futuristic world that never was.

An isolated, rusty phone booth commemorates Iceland's first international telegraph cable.

A giant concrete orb in far north Iceland marks the ever-shifting boundary.

A forgotten graveyard lost in the tangles of an overgrown garden.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

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

Tucked away near more famous landmarks lies a statue meant to symbolize the confluence and continuing development of human culture.

Possibly the world's largest hourglass only needs to be reset every New Year's Eve.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

This unattributed sculpture in Amsterdam is hiding in plain sight.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

This tiny museum's sizable collection is jammed into a former underground public toilet.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.

A wunderkammer of mysterious objects and stories.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.