From the plaque:
Here, beneath the hot, arid
surface of the San Joaquin Valley, Baldasare Forestiere
(1879-1946) began in the early 1900s to sculpt a fantastic
retreat. Excavating the hardpan by hand, he created a
unique complex of underground rooms, passages, and gardens
which rambled throughout a ten-acre parcel. His work is
being preserved as a living monument to a creative and
individualistic spirit unbounded by conventionality.
Plaque placed by the State Department of Parks and Recreation in cooperation witht he Rick Forestiere family. October 12, 1979.