Bradly J. Boner | Photography

Castle Geyser, Upper Geyser Basin

Visitors to the Upper Geyser Basin watch an eruption of Castle Geyser on Sunday in Yellowstone National Park. The geyser has the largest cone of mineral deposites in the basin and therefore may be one of the oldest. It erupts about 10 to 12 hours and can expel water up to 90 feet high.

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Visitors to the Upper Geyser Basin watch an eruption of Castle Geyser on Sunday in Yellowstone National Park. The geyser has the largest cone of mineral deposites in the basin and therefore may be one of the oldest. It erupts about 10 to 12 hours and can expel water up to 90 feet high.