This vast collection of smoking pipes from across the world spans centuries.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

Sculpture designed by Turkish artist and professor Mehmet Ali Uysal.

Sleep snuggled in a sphere suspended atop the forest canopy of Vancouver Island.

Once the nail factory shut its doors, this Swedish factory town was abandoned, leaving behind a modern ghost town.

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

It was meant to help transport wounded soldiers to a secret underground hospital.

A hidden bathhouse in one of Stockholm's oldest and busiest neighborhoods is open to anyone who can find it.

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

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

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

This castle ruin in the middle of nowhere is a gem for wildlife enthusiasts.

A centuries-old iron mine is now a paradise for explorers, divers, and spelunkers.

Tiny Swedish village with a distinct local phenomenon known as an "Elk Shower."

Gravity seems to fail at this intriguing Swedish attraction.

Despite the groans of archaeologists, this astounding groups of Bronze Age petroglyphs have been painted red for tourists.

A stunning silver lining to global warming's gloomy cloud.

Once the scene of a young boy's home in revolt, this Norwegian island is now home to the world's first "ecological" prison.

Art becomes an enchanting part of the environment at this wooded sculpture park.

Stay overnight in the world's most sleekly designed rabbit hole, free of charge.

Thousands of miniature bronze sculptures have taken over this city square creating a unique art installation.

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

An intricately carved Viking church overlooks a glistening fjord.

Walk 2,300 feet above the ground on the "Troll's Tongue."