Little Mount Hoffman Lookout
This grounded cabin sits atop a volcanic cinder cone in the Medicine Lake Highlands and has views of up to 80 miles in all directions. Explore the highlands' abundance of pumice, obsidian, and unique landforms — the area's geological oddities used to serve as a training ground for astronauts. Includes: Two twin beds but no cooking facilities or electricity. No water; vault-toilet building ($75 per night).
Location: Shasta-Trinity National Forest, California
Available: July 1 to second week in October
Elevation: 7,309 feet