Remains of a medieval cellar in the archaeological crypt under the parvis of Notre-Dame de Paris. It is NOT the "crypt" of the church, but ruins founded during excavations under the parvis
<a href="//commons.wikimedia.org/wiki/User:Jebulon" title="User:Jebulon">Jebulon</a>
<span class="int-own-work" lang="en">Own work</span>