Yellowstone - Upper Geyser Basin 
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Most of the geysers are in the Upper Geyser Basin, which is only 1 mi. long. A 2 hour trail (boardwalk) through the area takes visitors past Old Faithful, the Giantess Geyser, the Beehive Geyser, the Castle Geyser, the Grand Geyser and fountain basins shimmering in a rainbow of colors.
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Castle Geyser in Yellowstone National Park.
Vibrant color of Castle Geyser in Yellowstone National Park.
Grotto Geyser in the Upper Geyser Basin at Yellowstone National Park.
Colorful Morning Glory Pool in Yellowstone National Park.
Looking down on the Morning Glory Pool in Yellowstone National Park.
