Previously known simply as the National Atomic Museum, this brilliant Smithsonian Affiliate traces the history of the atomic age and how nuclear science has dramatically influenced the course of modern history. Exhibits include replicas of Little Boy and Fat Man (the bombs dropped on Japan at the end of World War II), a compelling display about the difficult decision to drop atomic bombs, and a look at how atomic culture has dovetailed with pop culture. There are also children's programs and an exhibit about X-ray technology. The campus also contains the 9-acre Heritage Park, which has a B-29 and other mega-airships, plus rockets, missiles, cannons, and even a nuclear sub sail. One highlight is the restored 1942 Plymouth that was used to transport the plutonium core of "the Gadget" (as that first weapon was known) down from Los Alamos to the Trinity Site for testing.