Courtyards 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, USA93722.(559) 271-0734.