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West Yellowstone, Montana
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Castle Geyser erupts approximately every 10 to 12 hours, making it one of the more predictable geysers in Yellowstone National Park.
The geyser can shoot water up to 90 feet into the air during its eruptions.
Castle Geyser has been active for about 5,000 years, based on geological studies.
The geyser's cone is made of siliceous sinter, a mineral deposit that gives it a distinctive castle-like appearance.
The eruptions are accompanied by a loud thumping sound, which is caused by steam and water forcing their way through the narrow vent.
The initial water phase is followed by a steam phase, which can last for up to 40 minutes.
The geyser was named for its resemblance to a castle, with its large, crenellated cone structure.
