The vault (shot vertically from below) of the <a href="//commons.wikimedia.org/wiki/Orecchio_di_Dionisio_a_Siracusa" class="mw-redirect" title="Orecchio di Dionisio a Siracusa">Ear of Dionysius</a> (Italian: Orecchio di Dionisio), an artificial limestone cave carved out of the Temenites hill in the city of <a href="//commons.wikimedia.org/wiki/Syracuse" class="mw-redirect" title="Syracuse">Syracuse</a>, Sicily, Italy. Picture by <a href="//commons.wikimedia.org/wiki/User:G.dallorto" title="User:G.dallorto">Giovanni Dall'Orto</a>, May 21 2008.
<a href="//commons.wikimedia.org/wiki/User:G.dallorto" title="User:G.dallorto">Giovanni Dall'Orto</a>
Attribution
<span class="int-own-work" lang="en">Own work</span>