If you are in the vicinity of the park between now and September 30, the Yosemite Museum Gallery just opened an exhibit of 40 mammoth plate photographs by Eadweard Muybridge, Carleton Watkins and Charles Weed from the NPS Museum Collection.

Prints such as these "pocket snapshots" by Watkins helped convince Congress to set Yosemite Valley and the Mariposa Grove aside in 1864.

Also included in the exhibit is a slide show of additional mammoth plate images, and others from the collection.