Le Grotte di Frasassi - http://www.frasassi.com/ Offers 70-minute trips and several longer, off-track excursions. Includes hours, rates, photos, history, nearby attractions and activities, and contacts. Located in Genga. [English, Italian, German, French and Spanish]
Grotta del Vento - http://www.grottadelvento.com/ Known as Wind Cave. Offers 3 different tours. Includes hours, fees, photo gallery, map directions and contact information. Located in Tuscany. [English, Italian, French and German].
Orvieto Sotterranea - http://www.orvietosotterranea.it/en/ Guided tours to the underground of Orvieto. Information, prices, booking.
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