Orvieto Underground
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There are several thousand caves located beneath Orvieto, of which only 2 are open to the public. ‎· Ken Morley
A system of subterranean cisterns and wells, and a steady supply of pigeons raised in chambers with access to the bluff walls, made the city near siege-proof. http://www.atlasobscura.com/places/orvieto-underground ‎· Ken Morley
I can verify the pigeon is pretty good! ‎· Ken Morley
کبوتر خانه جهت جمع آوری کود ‎· Mamad
@mirzaie I'm sure they used the manure for their plants. Nothing wasted. :) ‎· Ken Morley