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Crowds watching Old Faithful at Yellowstone National Park. WY. | Old Faithful erupts at Yellowstone National Park. WY. | Old Faithful spouts at Yellowstone National Park. WY. | Geyser Hill in Old Faithful area of Yellowstone National Park. WY. |
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Firehole River through Old Faithful area of Yellowstone National Park. WY. | Visitors watch steaming deposit in Old Faithful area of Yellowstone National Park. WY. | Colored ridge in Old Faithful area of Yellowstone National Park. WY. | Hot water explodes in Old Faithful area of Yellowstone National Park. WY. |
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Sulfur deposits in Old Faithful area of Yellowstone National Park. WY. | Sulfur deposits in Old Faithful area of Yellowstone National Park. WY. | Water boils in pool in Old Faithful area of Yellowstone National Park. WY. | Mini crater mound in Old Faithful area of Yellowstone National Park. WY. |
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Pools in Old Faithful area of Yellowstone National Park. WY. | Mineralized pool in Old Faithful area of Yellowstone National Park. WY. | Grand Geyser in Old Faithful area of Yellowstone National Park. WY. | Castle geyser near Old Faithful at Yellowstone National Park. WY. |
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Castle geyser at Yellowstone National Park. WY. | Castle geyser at Yellowstone National Park. WY. | Old Faithful Inn over geyser fields at Yellowstone National Park. WY. | Old Faithful Inn (1904) in Yellowstone National Park is the world's largest log hotel. WY. Architect: Robert C. Reamer. On National Register. |
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Window details of Old Faithful Inn at Yellowstone National Park. WY. | Old Faithful Lodge office & cafeteria log building at Yellowstone National Park. WY. | Old Faithful Lodge fireplace at Yellowstone National Park. WY. | Old Faithful Lodge hanging lamp with bears & train at Yellowstone National Park. WY. |
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Waterfall from Excelsior Geyser flows into Firehole River at Yellowstone National Park. WY. | Waterfall from Excelsior Geyser flows into Firehole River at Yellowstone National Park. WY. | Colored deposits along Excelsior Geyser outflow stream at Yellowstone National Park. WY. | Excelsior Geyser Crater at Yellowstone National Park. WY. |
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Colored deposits of Excelsior Geyser at Yellowstone National Park. WY. | Terraced minerals of Excelsior Geyser at Yellowstone National Park. WY. | Visitors on raised walkway above Excelsior Geyser of Yellowstone National Park. WY. | Grand Prismatic Spring beside Excelsior Geyser at Yellowstone National Park. WY. |
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Colors of Grand Prismatic Spring caused by microorganisms in 70 degree C water at Yellowstone National Park. WY. | Great Fountain Geyser at Yellowstone National Park. WY. | Detail of Great Fountain Geyser at Yellowstone National Park. WY. | Small deposit cone on Firehole Lake Drive at Yellowstone National Park. WY. |
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Mud erupts at Fountain Paint Pots at Yellowstone National Park. WY. | Fountain Paint Pots detail at Yellowstone National Park. WY. | Geyser steam under cumulus clouds at Yellowstone National Park. WY. | Geyser spouts along Fountain Paint Pots trail at Yellowstone National Park. WY. |
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Geyser color detail on Fountain Paint Pots trail at Yellowstone National Park. WY. | Twisted tree stump at Yellowstone National Park. WY. | Pine tees at Yellowstone National Park. WY. | Deep-blue pool steams at Yellowstone National Park. WY. |