The site of a tragic massacre that spawned a multimedia franchise.

Enigmatic bug-like sculptures mystify drivers along a Swedish highway.

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

One of the oldest wine cellars in Germany is now a restaurant beneath Bremen's town hall.

A spitting ode to a German serial killer.

Böttcherstraße's bells, extolling Nordic virtues and the great conquerors of the world.

A stunning gilt bronze relief denounced by Hitler as "degenerate art"—even though it was dedicated to the Nazi leader.

This statue and park honor the Swedish chemist Jacob Berzelius, one of the founders of modern chemistry.

A heated statue pays tribute to one of Sweden's great actresses.

When this 18th-century observatory's meridian was moved, it set Sweden's time back by 0.04 seconds.

A golden plaque marks the site of the mysterious unsolved assassination of the former Swedish prime minister.

What looks like a birch tree smushed between two pieces of glass often confounds commuters.

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

A massive, gleaming sea turtle with a rider atop its shell looks out over the horizon.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

The Hveragerði fissure runs through this unassuming shopping center.

A temporary art piece to celebrate LGBTQ Pride is now a permanent part of Stockholm's traffic landscape.

A miniature model of the iconic Stockholm department store.

A concrete mushroom that divided Stockholm residents for nearly a century.

A condensed piece of China floating in a Dutch harbor.

An unsettling sculpture of a boy hanging out in a street in Ghent has been baffling visitors for years.

This quarter-mile tunnel under the Bluff in Pittsburgh bends at a 45-degree angle.

Formerly the world's largest, this Willy Wonka-esque contraption runs 24/7.

The tallest church in Mechelen might have been the tallest in the world if not for a lack of funds.