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Mojave desert. Don't know that I'd call it my favorite, but I did spend an interesting 30 days here, while in the Army.
One of the most interesting mysteries of Death Valley National Park is the sliding rocks at Racetrack Playa (a playa is a dry lake bed). These rocks can be found on the floor of the playa with long trails behind them. Somehow these rocks slide across the playa, cutting a furrow in the sediment as they move.
The McMurdo Dry Valleys | A row of valleys in Antarctica. It has many interesting geological features including Lake Vida & the Onyx River. The valley's floor occasionally contains a perennially frozen lake with ice several meters thick. It is also one of the world's most extreme deserts under the ice, in the extremely salty water, live mysterious organisms. Scientists consider the Dry Valleys perhaps an important source of insights into possible extraterrestrial life.
The mystery of Death Valley's sailing stones has been solved - After decades of guessing, researchers finally caught the rocks in the act