The U.S. Department of Energy offers free, four-hour bus tours of the Hanford site ... mile site’s radioactive and chemical wastes. Map points are approximate locations of tour stops.

Environmental cleanup is underway at the 580-square-mile Hanford nuclear reservation. The underground radioactive waste storage tanks and the vitrification plant are in the center of the site.

The Hanford nuclear site in Washington state ... and workers are carrying out a lengthy process of decommissioning the nuclear reservation — The Seattle Times dubbed it "the nation's most ...