Been working on https://www.stainedglassatlas.com.

Trying to document and map as much of the publicly accessible stained glass as possible. The goal being the next time you visit a new city or town, you'll know where all the beautiful stained glass is to go see. Just recently added support for countries outside of North America. No exciting tech (vanilla HTML/CSS/JS). But excited for folks to check it out!

I like it but I'd like to see images right in your page instead of going to an external website which sometimes is not even dedicated to stained glass making hunting for visual gratification really painful.

So, I'd add more visuals to the main page just like on your 'search' link, move the map to the bottom, let visitors know of every new location to keep them engaged and coming back for more, make a gallery sorted by most liked, viewed, commented, valuable (subjective based on history, cost, location, etc)

Cool! You could even consider abstracting it into a tiny lib that could be used to map and showcase any kind of location-based visual data and not just stained glass.

How does that clustering in Leaflet work? I have a similar use case