Arches, Great Sand Dune, and Mesa Verde National Park

These two national parks - Great Sand dunes and Mesa Verde-are in Colorado that we've been to during this summer trip with my parents. Each of them has the different features that generate the different impression.

The Arches national park is full of arched, queer shaped, and gigantic rocks. The Great Sand Dunes was more than expectation. It was unusual undergo to walk, run, stroll on the sand dunes. The sand dune was great, as the name puts it. Lastly, the Mesa Verde park is, so to speak, the preserved places of the ancient indian shelter. Most of all, so suprised to see personally their houses on the cliff. Why they had to choose cliff for their houses?