Maarten Dammers, 29/02/20 22:12:
Late reply. Prado has been using the Wikimedia maps
for years, see
https://www.museodelprado.es/ .
Thanks! I had missed that (I rarely scroll that far). Funny.
Their website seems to have less traffic but the map is on the front
page. I'll definitely mention it next time I need an example. :-)
Federico