The pool of the Brentanobad <a href="https://en.wikipedia.org/wiki/en:Lido_(swimming_pool)" class="extiw" title="w:en:Lido (swimming pool)">Lido</a> in Frankfurt am Main, Germany.
<a href="//commons.wikimedia.org/w/index.php?title=User:Polypterus&amp;action=edit&amp;redlink=1" class="new" title="User:Polypterus (page does not exist)">Polypterus</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>