The scars of a remarkably organized public protest to save 13 elm trees are still visible in this Stockholm park.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

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

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

Stockholm's deepest subway station is also a stunning ecological wonder.

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

An ancient Viking runestone hidden in plain view in Stockholm's old town.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

Sound travels strangely in this underground whispering gallery.

An 11th-century runestone decorates the halls of Terminal 2 of this Scandinavian travel hub.

This unattributed sculpture in Amsterdam is hiding in plain sight.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

Where royalty waits in the height of luxury.

A set of seven houses, each built in a style that represents a European country.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

Eighty million natural history specimens call this gargantuan museum home.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

The colorful stairs are made with marble from the world's major quarries.

A verdant 17th-century-style garden hidden along Edinburgh’s Royal Mile.

The largest terracotta fountain in the world, built to commemorate Britain’s Victorian achievements.

The former home of the world-famous Templeton Carpet Factory.

This two-legged horse statue celebrates a beloved cartoonist and his quirky characters.

This monument dedicated to the legendary American showman can be found in Scotland's largest city.