Albert Einstein looms large in the history of the atomic bomb—and five inches tall in the gift shop of the Atomic Testing Museum in Las Vegas ($9). Visitors glimpse the gray-maned physicist in a welcome video, then experience a seat-shaking simulation of a test-site blast 65 miles away. Inter-active exhibits offer pro and con views of nuclear weapons. Einstein, a conflicted pacifist, would likely have approved. (702) 794-5161, www.atomictestingmuseum.org.