Delicate Arch in Utah's Arches National Park by Josh Myers

Mr. and Mrs. Magee on Clouds rest, Yosemite 1894 by Joseph N LeConte, courtesy Sierra Club Archives

Saguaro National ParkCopyright 2007 Matt Urban, courtesy Sierra Club Library

Saguaro National ParkCopyright 2007 Matt Urban, courtesy Sierra Club Library

Utah: Capitol Reef NPCopyright 2005 Robert Heil, courtesy Sierra Club Library

Yosemite National Park, CaliforniaCopyright 2005 Robert Heil, courtesy Sierra Club Library

Kings Canyon National Park, California, along the John Muir TrailCopyright 2004 Robert Heil, courtesy Sierra Club Library

Alpen glow on peak south of Kearsarge Lakes, Kings Canyon National Park in late summer 2007 Copyright 2008 Tom Valtin, courtesy Sierra Club Library

LeConte Canyon, Kings Canyon National Park. Copyright 2008 Tom Valtin, courtesy Sierra Club Library

Lembert Dome, Tuolomne Meadows, Yosemite National Park Copyright 2008 Tom Valtin, courtesy Sierra Club Library

Joshua Tree National Park, California Copyright 2004 Robert Heil, courtesy Sierra Club Library

Mr. Gould on summit of Mt. Gould, Kings River 1896 (Kings Canyon National Park) by Joseph N LeConte, courtesy Sierra Club Archives

River with girls, Yosemite 1897 by Joseph N LeConte, courtesy Sierra Club Archives

Three brothers from river, Yosemite 1897 by Joseph N LeConte, courtesy Sierra Club Archives

Presidential party at Big Trees, Yosemite, 1903 by Joseph N LeConte, courtesy Sierra Club Archives

The 'Middle Fork Party' in King's River Canyon (Kings Canyon National Park) by Joseph N LeConte, courtesy Sierra Club Archives

Kings Canyon National Park, California, along the John Muir Trail. Copyright 2004 Robert Heil, courtesy Sierra Club Library

Horseback riders in Kings Canyon National Park, California, along the John Muir Trail. Copyright 2004 Robert Heil, courtesy Sierra Club Library

Pines on Liberty Gap, Yosemite, 1909-9th Sierra Club Outing by Edward Taylor Parsons, courtesy Sierra Club Archives

Tuolumne Meadows, Cathedral Range. 1914-14th Sierra Club Outing.by Edward Taylor Parsons, courtesy Sierra Club Archives

Sliding down glaciated granite, Yosemite, 1914-14th Sierra Club Outing by Edward Taylor Parsons, courtesy Sierra Club Archives

Yosemite National Park, California Copyright 2005 Robert Heil, courtesy Sierra Club Library

Kings Canyon National Park, California, along the John Muir Trail. Copyright 2004 Robert Heil, courtesy Sierra Club Library

The Kaweahs from Little Five Lakes (Sequoia National Park)by Cedric Wright, courtesy Sierra Club Archives

'From colouir along Whitney trail; the Kaweahs beyond Mt. Hitchcock; Great Western Divide to left - N.C.' Also Lower Hitchcock Lake -P.B. (Sequoia National Park) by Cedric Wright, courtesy Sierra Club Archives

Moraine Lake, Mt. Kaweah (Sequoia National Park) by Cedric Wright, courtesy Sierra Club Archives