Trona Pinnacles, just outside Death Valley, were formed in the same manner the famous tufas of Mono Lake. In other words, this area was once a lake and these enormous spires grew from the ground up from mineral deposits.
Nighttime Joshua Trees at the Mojave National Preserve
Joshua Trees! They define parts of the Mojave Desert and the largest Joshua Trees forest is found at Mojave National Preserve.
Saguaro Cactus at Night
The night sky and iconic Saguaro Cacti pretty much define the deserts of Arizona.