These are NOT AZTEC ruins as we would think of Mexico, but ancient ruins found in Navajo country.
Those appear to be Cottonwood trees behind the walls of a ruin found in Aztec, New Mexico!
(Similar to Salmon Ruins)
http://www.centerfordesertarchaeology.org/visit/salmon.html
Okay. I did a quick serch for Aztec ruins+images and that's what I got.