A courtyard at Forestiere underground gardens: a hand built system of underground tunnels, courtyards and niches in Fresno, California, USA. Baldasare Forestiere was a Sicilian immigrant who arrived in Fresno in 1905 and spent 40 years digging the subterranean network planted with fruit trees and grape vines. Forestiere Underground Gardens.5021 W. Shaw Avenue,.Fresno, CA,