(I've added links to photographs Andy didn't reproduce in the original posts)
1: Minor White's, Capitol Reef, Utah (1962)
2: Ansel Adams' Monolith, The Face of Half Dome, Yosemite National Park, 1927 (see it here)
3: Henri Cartier-Bresson's Siphnos, Greece, 1961
4: Edward Weston's Pepper No. 30, 1930
5: André Kertész's Mondrian's Glasses and Pipe, Paris, 1926
6: Harry Callahan's Ivy Tentacles on Glass, Chicago, 1952 (see it here)
7: Bruce Barnbaum's Circular Chimney, Antelope Canyon (see it here)
8: Galen Rowell's Rainbow over the Potala Palace, Lhasa (Tibet, 1981) (see it here)