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All references and links of caves_underground_places
Attractions:
Underground Naples
Fontanelle Cemetery
Catacombs of Saint Januarius
Napoli Sotteranea
Wind Cave
Chiesa di Santa Lucia alle Malve
Casa Grotta nei Sassi
Neptune's Grotto
Nereo Cave
Grotta di Ispinigoli
Grotta del Bue Marino
Zinzulusa Cave
Grotta Gigante
Grotta Azzurra
Pertosa-Auletta Caves
Grotta dello Smeraldo
Blue Grotto
Ear of Dionysius
Cryptoporticu
Frasassi Caves
Well of the Cave
Orvieto Underground
Castellana Caves