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V.C. Wald: Grand Prismatic Spring, with bison tracks
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V.C. Wald: Prisms in the steam: Grand Prismatic Spring
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V.C. Wald: Grand Prismatic Spring
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V.C. Wald: Grand Prismatic Spring, Calothrix cyanobacteria
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V.C. Wald: Grand Prismatic Spring
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V.C. Wald: Down on the boardwalk
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V.C. Wald: Excelsior Crater
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V.C. Wald: Crater's edge
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V.C. Wald: Runoff from across the Firehole River
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V.C. Wald: Runoff by the bridge
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V.C. Wald: Runoff, close up
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V.C. Wald: Secrets from the Depths
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V.C. Wald: What?
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V.C. Wald: Up from Middle Earth
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V.C. Wald: Opal Pool
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V.C. Wald: Opal Pool
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V.C. Wald: Turquoise Pool
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V.C. Wald: Gibbon Falls, wider than it is tall?
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V.C. Wald: Gibbon Falls and Gibbon Canyon
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V.C. Wald: Up from the Underworld: Beryl Spring Fumarole
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V.C. Wald: Bubbling Beryl and Hissing Fumarole
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V.C. Wald: Beryl Spring's Gemstone
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V.C. Wald: Gibbon Falls detail
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V.C. Wald: Yellowstone River from Grand View
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V.C. Wald: Yellowstone River from Grand View
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V.C. Wald: Rustic Information, Grand View Point
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V.C. Wald: The Canyon Wall
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V.C. Wald: Beneath the Canyon Rim
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V.C. Wald: A closer look at the Lower Falls
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V.C. Wald: Grand Canyon of the Yellowstone