A high school astronomy enthusiast designed this model of our solar system to be traversed on foot.

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

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

North America's first frozen mummified remains of an ice age steppe bison, the 36,000 year-old mummy named "Blue Babe."

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

While not recognized by Guinness, this chocolate waterfall is likely to be the world's largest.

Four-story concrete hotel never opened to customers.

The ghostly remains of what was once the world's richest copper mine.

A trading post in the North Pole where children send letters.

The king of U.S. high points towers over every other peak on the continent.

Mind-blowing carvings and fantasy ice scenes grace the largest year-round ice environment in the world.

Daily jousts and dancing barrel makers in Munich's mechanical clock.