Sunrise over the Sangre de Cristo Mountains. Great Sand Dunes National Park, Colorado. 2018.

Sunrise over the Sangre de Cristo Mountains. Great Sand Dunes National Park, Colorado. 2018.

Gwynn standing on the edge. Black Canyon of the Gunnison National Park. Colorado. 2018.

Gwynn standing on the edge. Black Canyon of the Gunnison National Park. Colorado. 2018.

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Nightly exodus of thousands of Mexican free-tailed bats. Carlsbad Caverns National Park, New Mexico. 2001.

Nightly exodus of thousands of Mexican free-tailed bats. Carlsbad Caverns National Park, New Mexico. 2001.

Toklat River and the Brooks Range. Denali National Park, Alaska. 2007.

Toklat River and the Brooks Range. Denali National Park, Alaska. 2007.

Sunrise in the House of the Sun. Haleakala National Park, Hawaii. 1999.

Sunrise in the House of the Sun. Haleakala National Park, Hawaii. 1999.

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Holgate Glacier entering Aialik Bay. Kenai Fjords National Park, Alaska. 2007.

Holgate Glacier entering Aialik Bay. Kenai Fjords National Park, Alaska. 2007.

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Big sky on trail across plateau. Theodore Roosevelt National Park, North Dakota. 2016.

Big sky on trail across plateau. Theodore Roosevelt National Park, North Dakota. 2016.