Yellowstone National Park is one of the most geologically active places on Earth.
There are hundreds of geysers, hot springs, and mud volcanoes. In fact, half of the world's geothermal features exist within the park's borders.
Historically, it is believed that the park has seen two very giant volcanic eruptions.
One volcanic eruption was 640,000 years ago and the other one was bigger and happened 2 million years ago.
These eruptions were unlike any volcano we have seen in our lifetime and if one occurred today it would radically effect everyone living anywhere close to the region.
So what's next for Yellowstone?
Scientists have been reporting an increase in small earthquakes from that region, but they have a hard time predicting any future eruptions.
Photographer Alan Jones took these amazing photographs of some of Yellowstone's geothermal features.
We should all try to visit Yellowstone before she blows.