An acoustic anomaly with a mysterious cause sits in the heart of Tulsa.

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

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

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

This frozen tunnel in central Alaska is both an engineering feat and a valuable climate classroom.

An abandoned aircraft sits submerged in a lake in the Alaska wilderness.

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

Research missiles and rainbow auroras at the world's largest land-based rocket range.

This whimsical stacked cabin looks like something out of a children's book.

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