John introduced us to the Pratt Institute Libraries Flickr album of bookplates. This image caught my eye:
[from Flickr metadata]
Artist: Ehringhausen, Willy
Description: States, 'Johanna Hoffschulte;' depicts a cityscape
with a cathedral and is surrounded by a border
made of roses. Signed at bottom center 'WE.'
[with tag "German"]
Well, of course, I'm curious to figure out what city. It looked like Cologne Cathedral and another medieval church tower with a distinctive shape. Yup. That's it. The church on the left is Great St Martin, with foundations dating to 960 CE and with a central tower dating to 1150-1250. The cathedral was just getting started in the mid 13th century.