1000-1875

Clean water for a young Philadelphia
Carleton Watkins and the business of seeing the American west
John James Audubon, The Wild Turkey
The painting that inspired a National Park
Hetch Hetchy, Yosemite, and the battle for National Parks
Frederic Church, The Natural Bridge, Virginia
Science, religion, and politics, Church's Cotopaxi
Revisiting a frozen sea