A special feature for the history of Monteverde is the presence of a proper underground quarry in the basement of the University Hospital of San Camillo.
Speleologists of underground Rome, in 2013 did a survey and in May 2014 they published photos and news on the rediscovery of this extraordinary underground lake.
It dates back to the institute building sanatorium, when, during the construction of the foundations, was discovered an underground cave, on which the foundation of the structure were placed.
The cave, large 7000 square meters and 10 meters high, consists of a greenish yellow stone walls that characterize the subsurface of the neighborhood, and maintains a constant temperature throughout the year, equal to 13 degrees.
A part of it, about 50 meters, is full of ground water, drinking water, which was used for the hospital and for the irrigation of gardens of the complex.