The picture to the left is a geyser called Old Faithful. This geyser could possibly be one of the most famous in the world. Believe it or not, it it the most predictable geographical feature on Earth. It erupts every 91 minutes. I remember waiting around, walking through the park, trying to time it exactly right so we got back in time to pull out our cameras. They also have a sort of countdown of minutes until it erupts. It's truly amazing how precised something that we cannot control is. This geyser can shoot hot water up to 32 m in the air!
It blows my mind still that you can get that close to something so strange and mysterious. You look at them and want to dive in to explore. I don't think most people know much about geysers or hot springs, but they're amazing in my opinion & I'd suggest everyone goes to Yellowstone National Park at some point in their lives to experience these things.