Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

An Alaska livestock farm devotes itself to harvesting wool from creatures that once ran with mammoths and sabertooth tigers.

Colorful boxes placed over the dead are left to rot and crumble.

Considered by many to be one of the most dangerous highways in Alaska.

Fascinating early attempt at a Jewish autonomous settlement.

This massive glowering Lenin head gazes out over eastern Siberia.

This stunning concert hall has become a symbol of Iceland's national recovery.

This verdant, tree-lined Reykjavik graveyard is both enchanting and eerie.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Medicinal spa created with the discharge from a geothermal energy plant.

This mysterious, medieval cathedral remains unbuilt but fiercely protected.

Take a dip beneath the stalactites in this amazing cenote.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

These winged Maya figures are the subject of speculation and conspiracies.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

This spot along the 23.5 degree north parallel marks the northern boundary of the tropics.

One of the most unusual geological features, recognizable from a dozen hit movies.

The tragedy of the Japanese internment camps is remembered here by a stark "Soul Consoling Tower."

The interior of the Overlook Hotel in "The Shining" was based on this Yosemite original.

Hidden inside a gift shop that doubles as a museum, this gargantuan yo-yo can only be operated by crane.

A trash dump made beautiful by nature's power.

A raised boardwalk winds through a thicket of stunted, century-old trees no more than nine feet tall.