This is a photograph of the entrance to the original roundhouse of the Nikolaev Railway / Saint Petersburg–Moscow Railway at the locomotive depot at Moskovsky railway station (Saint Petersburg). The roundhouse was used to house the locomotives and it dates from the 1850s.
<a href="//commons.wikimedia.org/w/index.php?title=User:Harveyqs&amp;action=edit&amp;redlink=1" class="new" title="User:Harveyqs (page does not exist)">Harveyqs</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>