False Kiva
This little cave, located in the Island in the Sky district of Canyonlands, is becoming a required stop on the pilgrimage of every landscape photographer. Not quite Mesa Arch yet, either in popularity or in beauty -- or in ease of access.
I took a 360 interactive panorama from the middle of the "kiva" area, which you can see by going to my Web site and clicking on "Virtual Reality" in the header, and then clicking on "False Kiva".