The great cone of Castle Geyser is a majestic sight even when it's not errupting. Just imagine how many years this feature's sinter cone was in formation at an inch every 100 years! It's one of the largest in the World. Add to this grandeur the 75' high eruptions that last for twenty minutes followed by a wonderful steam phase that lasts twice as long and you'll be in awe. Lastly, for the ultimate experience, add one rainbow. Just try to breathe with it taking your breath away!
tagged: rainbow over castle geyser Scenic NPS
