Excerpt from ALIEN MAGIC by William H. Hamilton III) One of the earliest American underground facilities was built at Raven Rock in Pennsylvania. The military refer to it as “Site R.” Sounds like “Section D.” Raven Rock was picked because it is made of greenstone, a type of granite that is the fourth hardest rock on earth. Construction started in 1950, and engineers had completed a series of tunnels and a three-story building by 1953. Two more three-story […] Read More