Volcanic cone at Craters of the Moon National Monument, Idaho.

Sitting on a lava flow at Craters of the Moon National Monument, Idaho.

Sitting at the entrance to a cave at Craters of the Moon National Monument, Idaho.

Lava flows at Craters of the Moon National Monument, Idaho.

Craters of the Moon National Monument and Preserve is located in the Snake River Plain in central Idaho. It became a National Monument on May 2, 1924. In 2000, a presidential proclamation expanded the Monument area, and in 2002, it was designated a…

Craters of the Moon National Monument and Preserve is located in the Snake River Plain in central Idaho. It became a National Monument on May 2, 1924. In 2000, a presidential proclamation expanded the Monument area, and in 2002, it was designated a…

Black and white lantern slide of a lava cap south of Pocatello, Idaho, with a railroad and road in the mid and foreground.