Mesa Verde
Mesa Verde was the first national park to be designated for the human constructions that it contains rather than the natural features. The part contains the remains number of buildings from the Puebloan people, stone age farmers who lived here from about 550 CE to 1300 CE. Around 1190 CE they stopped building on the top of the mesa and started building under overhanging cliff faces. Nobody is quite sure why they did this. Possibly they ran out of land…