The <i>Powder tower</i>, part of the city walls of <a href="https://en.wikipedia.org/wiki/Steckborn" class="extiw" title="en:Steckborn">Steckborn</a> (Switzerland) on the <i>Untersee</i>, a part of <a href="https://en.wikipedia.org/wiki/Lake_Constance" class="extiw" title="en:Lake Constance">Lake Constance</a>.
<a href="//commons.wikimedia.org/wiki/User:Wattewyl" title="User:Wattewyl">Wattewyl</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>