The Nuclear Legacy Atomic Archive . An excellent introduction to the Cold War. Fifty Years from Trinity . Drawn from a special series in the Seattle Times, this site contains 3 articles on Trinity, the Nevada test site, and Hanford, as well as some supplementary materials and an interactive quiz.
Articles provide both historical and contemporary information.
Remembering Nagasaki . The Exploratorium, a science museum in San Francisco, constructed this site. The highlight of the site are the photographs of the city in ruins taken by Yosuke Yamahata. A considerable portion of the site is dedicated to visitors' memories and impressions of the bombing. Trinity Atomic Web Site.