If playing in a giant sandbox appeals to you, the Great Sand Dunes National Park and Preserve near Alamosa is a must-visit. This giant dune field of 30sqmi (78sqkm) features at least one dune that’s more than 750ft (229m) high. Sledding down the dunes is a popular pastime, as is hiking and camping. There are also horseback riding trails and the scenic four-wheel drive on Medano Pass.
Cliff Palace and Balcony House are ancient cliff dwellings that the ancestral Pueblo Indians inhabited in the 12th and 13th centuries. Located in Mesa Verde National Park, both are World Heritage Sites and National Monuments. Balcony House had forty-five rooms and two kivas (ovens), and it can only be accessed on ranger-guided tours. Tour participants must climb a thirty-two foot ladder and then crawl through a twelve-foot tunnel to access Balcony House.