The first time I saw this mound of dirt with its built-in crater, it "screamed" volcano to me. It was also a fun piece to pull off. The site is located under the 93N expressway in Boston, and we were very visible with lot's of traffic going by... This meant evading State Police patrols as well as not being detected by personnel at a Boston Police garage located directly across from us... Timelight Picture Study with Highway Flares & Fireworks Time-Exposure on film.