A giant concrete dome filled with radioactive dirt, smack dab in the Pacific Ocean [Modernruins]: "
In 1958, the United States tested the 18-kiloton 'Cactus' nuclear device on Runit Island in the Pacific. 20 years later, Cactus' 350-foot-wide crater was filled with radioactive soil and covered with a 100,000-square-foot concrete dome. Worst vacation ever? More »