Valles Caldera National Preserve
Prepare to drop your jaw at this 89,000-acre expanse west of Los Alamos. The working ranch and preserve is nestled in a volcanic caldera that formed after a supervolcano erupted 1.25 million years ago. The blast was so strong that molten magma blew 95 miles into the stratosphere. Summer activities include hiking, mountain biking, equestrian trail riding, and fly-fishing.