Manhattan Project Hanford B Reactor Tour
Every year, the Hanford site offers free guided tours of the Manhattan Project B Reactor, the first full scale nuclear reactor. Built during WWII, it produced plutonium for use in atomic bombs. The reactor continued operating until 1968.
More recently, after most of the top secret work at Hanford ended, the Reactor was opened up to tours of the general public. In 2008, the B Reactor was designated a National Historic Landmark, and is likely to eventually become part of the proposed Manhattan Project National Historical Park.
The B Reactor lasts about five hours. The reactor is about an hour bus ride outside of Richland, and you spend about three hours at the reactor itself. On the tour, you'll see the immense reactor face and the dial filled control room. As the reactor was in operation between WWII and 1968, you'll see multiple eras of the atomic age represented. Some of the items and equipment are classic WWII, but other sections are clearly Cold War.
It doesn't look anything like what you'd expect a nuclear reactor to look like. There aren't three foot lead-glass windows. There aren't giant concrete bunkers. You can walk within feet of the exposed reactor face. The whole thing looks pretty much exactly like what you'd expect a crazy top secret government-funded science project to look like. If you dropped someone in the reactor room and told them that they were standing in front of an interdimensional trans-galactic portal generator, they would believe you.
Many of the people on the tour commented that they were amazed that all of it was done without computers. What was perhaps more impressive to me was the feeling that somewhere out there, someone in a secret lab is doing something just as impressive today.

I took the morning tour on May 2nd, 2012.
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