These photos were taken in Great Sand Dunes National Park (CO) in May 2010 and May 2018 using a Canon t1i with various L lenses.
Great Sand Dunes National Park is one of the most interesting places I have been in the Southwest. Photography was fun and while out there I managed to do a lot of hiking. One of the major dunes there (High Dune) I hiked to the top of twice. I also hiked to the top of Star Dune which is the tallest dune in North America. Not only does the dune system sit at the base of snow capped mountains but it also has a nice stream which runs along its base for some of the year.