These hellish-looking cliffs in the Canadian Arctic have been burning for centuries.

The Arctic Archipelago is home to world's largest third order island: an island in a lake on an island in a lake on an island.

A prehistoric geological oddity tucked behind Stockholm's natural history museum.

Inside this church, a monument honors the first burial site of the famed philosopher.

This giant subway sculpture celebrates the fruit that inspired the theory of gravity.

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

A former suicide bridge is now accumulating symbols of love instead of a body count.

Stockholm's tiniest statue is of a small boy looking at the Moon.

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

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

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

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

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

Gargoyle head that brings good luck.

Also known as the Founding Church of Scientology.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

The history and future of cannabis.

The world's only museum devoted to the wonders of fluorescence.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

Secret Swing.

The Incredible Hulk, Yoda, Mulder and Scully, and many many others watch over the mean streets of Toronto.

The Victorian-era greenhouse is stuffed with tropical plants, and open 365 days a year.