Idaho

By Travelog Editorial Team · Updated August 8, 2026

Idaho is live on Travelog with one city, Arco, home to Craters of the Moon National Monument. Entrance costs $20 per vehicle. On August 22, 1969, NASA brought Apollo 14 astronauts Alan Shepard, Edgar Mitchell, Joe Engle, and Eugene Cernan here to train in volcanic geology, since the moon's surface is largely volcanic and the astronauts, all pilots rather than geologists, needed genuine field training to describe lunar samples accurately.

The documented reason NASA chose this specific volcanic landscape for astronaut training is worth understanding before visiting, covered in full below.