hypogeum
underground temple or tomb
Naples underground geothermal zone
underground museum in Chiaia, Municipality 1 of Naples, Italy
Tomb of Orcus
hypogeum
Underground Pistoia
museum in the Ospedale del Ceppo, Pistoia, Italy
Rock-cut architecture of Cappadocia
Archaeological site in Cappadocia, Turkey
Hypogeum of via Livenza
archaeological site in Rome, Italy