At the height of World War I, the U.S. scrambled to build a chemical weapons program to match Germany's. The Army developed (and tested) these weapons in the nation's capital, and some drums remain buried beneath the city's neighborhoods. Check out candid photos from the chemical weapons facilities in Washington and a video of our guest Erik Olson discussing some of his favorites on our Facebook page at www.facebook.com/the1ashow. | Want to support 1A? Subscribe to our podcast and give to your local public radio station at donate.npr.org/1A. Email the show at 1a@wamu.org.