Swedish skyscraper with a 90° twist.

Uppsala's adorable feline sign celebrates a popular children's book set in the Swedish city.

A large collection of ancient runestones decorates this university courtyard.

Sweden's oldest street has not changed for nearly a millennium.

A Swedish phone box converted into an informal village library.

A tiny town hall—in Sweden's one-time capital—might be the smallest in Europe.

A rare rune stone dedicated to a woman.

This poignant sculpture of a gnarled weapon is a symbol of non-violence.

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

Stockholm's narrowest alley is barely over two feet wide.

A wooden street sign is the last remnant of this 400-year-old alleyway.

The library's graceful rotunda is like a bibliophile's temple.

Enormous ants wielding giant pine needles guard a Stockholm real estate company's office.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

In downtown Oslo, a menacing and terrifying relief clings to a church wall.

The first thermometer made with the almost-universal temperature scale is backwards.

The three colorful women depict characters from a beloved children's story.

The signatures of esteemed colleagues of the physicists who stopped by to attend lectures.

Absolutely no saxophones in the library.

Be(w)ar(e) the moat around this historic Czech castle.

A church of bones, decorated with 40,000 human skeletons.

France's most famous cemetery, with some of its most curious tombs.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

One of the famous Czech artist's lesser-known Prague installations appears to be a glowing fetus affixed to a drainpipe.