On the California coast, its entire length documented with georaphically referenced aerial photographs.
On grasses, a database of over 10,800 world species.
On the National Mall, subtitled Third Century Initiative.
On a stroll through Central Park with some help from CentralPark.com.
On re-wilding the Great Plains.
On the Army Corps of Hubris, a New Yorker article by John McPhee from 1987 on efforts to tame the waters of Louisiana.
On mapping the National Parks, another from the seemingly bottomless archives of American Memory, Library of Congress.