This greenhouse was once a hockey arena.

Natural earth mounds formed in the far north.

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

Over 400,000 birds spend their summers nesting on this small Arctic island.

The closest thing to Mars on Earth.

The remote graves mark the mysterious deaths of four 19th century explorers.

A modern version of the stone cairns built by the Inuit.

Rare mummified forest could offers a glimpse into how our environment has been changed by humans.

The third-largest island in Canada is one of the remotest places on Earth.

Earth's greatest purely vertical drop at 4,101 feet.

Greenland's first shopping mall also hosts the country's government.

Thousands of letters to Santa get delivered to this mailbox in Greenland.

No longer the only, but definitely the oldest, fountain in Greenland.

One Greenland town turned itself into an open air sculpture gallery with the help of a series of traditional stone artworks.

Walrus skulls and narwhal bones were found here while excavating a 900-year old church.

In a country where driving from one town to another is literally impossible, this small stretch of gravel is a remarkable feat.

A Cold War atomic camp buried under the ice is now emerging because of global warming.

Small Island off the coast of Greenland.

The 3.8 billion-year-old rock proves that tectonic plates may have been shifting longer than we thought.

The world's northernmost flowers cling tenuously to life on desolate Kaffeklubben Island.

A surprisingly beautiful abandoned World War II military base in East Greenland.

A once-glowing grotto at the bottom of Waikapalae Wet Cave.

A Hawaiian stairway to heaven—that you can't climb.

This monument built by Japanese American immigrants spent decades underground.