48. Old Faithful – Yellowstone National Park
Old Faithful is probably the most well-known attraction in Yellowstone National Park. It’s a cone geyser that erupts every 60 to 110 minutes, so it’s very predictable as to when another eruption will occur (via Oyster). When it does explode, the geyser can be as high as 130 to 140 feet. Furthermore, it shoots out as much as 8,400 gallons of water all at once. There’s a reason tour guides don’t want you to get near it because the water is boiling (via Oyster).