The main entrance to the former Bristol and Exeter Railway headquarters building at Temple Meads station, Bristol, England.  Near the top of the facade the letter "F" is carved into the stonework, the initial of Samuel Fripp, the architect of the building.
<a href="//commons.wikimedia.org/wiki/User:Geof_Sheppard" title="User:Geof Sheppard">Geof Sheppard</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>