The presence in the Judean Lowlands of thick and homogeneous chalk sub-strata enabled numerous caves to be excavated and managed by Man. The property includes a complete selection of chambers and man-made subterranean networks, of different forms and for different activities. They are situated underneath the ancient twin cities of Maresha and Bet Guvrin, and in the surrounding areas, constituting a “city under a city”. They bear witness to a succession of historical periods of excavation and use, over a period of 2,000 years. Initially, the excavations were quarries, but they were later converted for various agricultural and local craft industry purposes, including oil presses, columbaria, stables, underground cisterns and channels, baths, tombs and places of worship, and hiding places during troubled times, etc. With their density, diversified activities, use over two millennia and the quality of their state of preservation, the complexes attain an Outstanding Universal Value.