Sundials and relief on the façade of the Dönhoff Chapel, part of the basilica on the Jasna Góra rock, Częstochowa, Poland. The dial on the left features Arabic numbers, while that on the right features Roman numbers.
<a href="//commons.wikimedia.org/wiki/User:Jacek79" title="User:Jacek79">Jacek Rużyczka</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>