Yellowstone National Park

Old Faithful geyser. It blows every 90 minutes

Castle geyser was actually more impressive. While it wasn't as predictable it erupted for a longer period.

Thermal holes with gases bubbling up from below. The white is mostly silica and brown is a bacteria mat. Its amazing anything lives in that.

Boiling mud pots. Its made up of silica and volcanic ash. Its like liquid clay that the hot gases come up through. Good place to dump the bodies.....