Really cool! I built the website for an antique maps dealer (Dat Narrenschip) when I was 15 or so and fell in love with antique maps. It's still up and running but now on Shopify.

Over the years I experimented a bit with leaflet.js and thought of overlaying maps too so you can navigate maps through time, but quickly realized it was super difficult. Kudos for setting this up!

If you want to expand to other regions, or chat, or get access to high-res scans, let me know. I think plenty of old maps sellers would love to sell their maps this way.