Designed by American Architect Mary Colter the Desert View Watchtower was completed in 1932.
The bottom floor houses a gift shop while the upper floors serve as an observation deck.
More information can be found at https://www.nps.gov/places/000/desert-view-watchtower.htm
Photo taken April 14, 2019.
Rick Horne 
Nice capture! It looks like you had much better weather than we did when we were here in January.