1 Best Sight in Great Sand Dunes National Park, Colorado

Colorado's first military post was established here in 1858 to protect settlers in the San Luis Valley, which was then part of the Territory of New Mexico. The legendary Kit Carson once served here, and the six original adobe structures are still standing. The fort features a re-creation of the commandant's quarters from Carson's era, as well as period military displays, and a rotating local folk-art exhibit.