Zion National Park, two of the Three Patriarchs.

Zion National Park, the Narrows.

Mesa Verde National Park.

Grand Canyon National Park

Arches National Park, Double Arch.

Yellowstone National Park, Lone Star Geyser.

Glacier National Park, Plenty Glacier area.

Death Valley National Park, Zabriskie Point.

Death Valley National Park, Dante's View.

Arches National Park, entrance area looking toward Moab, UT.

Arches National Park, Delicate Arch.

Arches National Park, through North Window Arch toward Turret Arch.

Arches National Park, Garden of Eden.

Bryce Canyon National Park, Natural Bridge.

Grand Canyon National Park, Colorado River at base of Bright Angel Trail.

Grand Canyon National Park, Rowe's Point (today's Hopi Point.)

Yosemite National Park, Glacier Point, Overhanging Rock.

Yosemite National Park, Wawona Tunnel (view of Yosemite Valley.)

Yosemite National Park, Vernal Falls along Mist Trail.

Yosemite National Park, climbing Half Dome (cables in modern view.)

Yosemite National Park, view from summit of Half Dome.

Acadia National Park, Thunder Hole.

Acadia National Park, Precipice Trail.

Hawaii Volcanoes National Park, Thurston Lava Tube.