Yellowstone National Park is like no other place on earth. With more volcanic thermal features - boiling mod pots, hot springs, geysers, and fumaroles - than the rest of the world combined, and a plethora of wildlife, Yellowstone is a photographer's dream - one perched atop an active supervolcano! Some of the park resembles a wilderness preserve, other parts an alien planet (really!). All of it is fascinating.