It was a surprise to see the Hanford Site pop up on the N.Y. Times’ “American Journeys” column but low points in history are the critical ones to remember. With advance planning, you can tour Hanford’s B Reactor which provided the plutonium for “Fat Man.” Located in south-central Washington, the Hanford nuclear reservation is a huge environmental clean-up site with nine decommissioned atomic reactors and tons of liquid and solid nuclear waste, not to mention decades of controversy. There’s a lovely buffer zone around the site where the Columbia River flows and nature abounds.