Street artists transformed this abandoned industrial neighborhood into one of Europe's largest graffiti exhibitions.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

This Stockholm light tower can be controlled by anyone with a smartphone.

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

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

The final resting place of the author who gave us the Little Mermaid, the Ugly Duckling, and many more beloved fairy tales.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

Copenhagen's "other" little mermaid marks the historic location of past sea maid sightings.

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

This striking pig statue was part of a 1993 guerilla art project against racism.

At this Arctic outpost, get to know members of the indigenous Sámi community and meet their herds.

The world's northernmost aquarium looks like it has fallen over.

After years of being casually peed on by humans, this tree is peeing back.

Somber memorial to the May 10, 1933, book-burning which took place on this spot.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

This historic building displays the remains of a victim of the devastating 14th-century plague.

On the eve of a condemned prisoner's death, this bell rang 12 times outside their cell.

The anatomical-pathological collection of a man who changed surgery.

The bones of two medieval royal lions were discovered at the historic fortress.

Eighty million natural history specimens call this gargantuan museum home.

Hidden in the courtyard of the Victoria and Albert Museum is a little-known tribute to two celebrity pooches.