Forestiere Underground Gardens, California

An underground complex excavated by a Sicilian immigrant named Baldesare Forestiere. He learned tunneling techniques at his first American job, working on New York City's aqueduct system. He bought land in Fresno, hoping to open a citrus plantation, but the land turned out to be solid rock underneath the topsoil, and unsuitable for farming. So in 1906 he began digging, and by the time he died in 1946, he had been at work for forty years and had excavated a reported 50 rooms.