Orvieto underground. The 2700 year-old Etruscan tunnel network consists of over 1200 caves dug under the hilltop town of Orvieto. The caves and deep water wells allowed the Etruscans to withstand a two-year siege by the Romans before being conquered. #trekarooing #familytrip #familytravel #travelwithkids #takeyourkidseverywhere #orvieto #orvietoitaly #orvietounderground #italy