Baldassare Forestiere spent 40 years (1906-1946) digging out 10 acres of tunnels under Fresno California to escape the heat and create underground gardens fed by skylights. He did this all by hand. Amazing. This photo is of a part of his living quarters and has a planter with an overhead skylight and the room to the rear had his well. More info at historicfresno.org/nrhp/forest.htm.
(3 photos merged in photomatix.)