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The Grotta di Matromania (or Mitromania or Matrimonio) is a large, natural cavern on the east coast of the island of Capri, Italy. It is located near the Arco Naturale. The cavern is approximately 27 m long, 18 m wide, and 18 m high. It is connected with Mithras.
References
Grotta di Matromania Wikipedia(Text) CC BY-SA