I've tried to find a list of exactly which museums are covered by the MilanoCard, as in:
"Discounted prices for the best museums and attractions in Milan". Do what it says on their website, but no specific list can be found there. Does anyone more specific information? We were looking at the 3-day pass, but can't find anything listed other than the Duomo, which, of course, we do want to see. But the Brera Gallery, the Sfortza Castle Museum?, etc?
You have my sympathy. I've run into the same problem with some other city cards. Sometimes the information is on the web but impossible to find by clicking through the web site. Googling the right combination of words sometimes works.
There seems to be a Milan Card app. Try poking around on it.
You can't find a list because they don't want customers to realize that no museum is fully covered by the Milano Card, only the Duomo's roof.
Read here https://www.milanocard.it/services-of-milanocard.html
They even dare to sell the "Civic Museums Pass" together with the "3 days" Transit Pass at 33 Euro. But the transit pass costs 13 Euro on the official ATM-Milano app and the Civic Museums Pass costs 12 Euro on the official Vivaticket site. Even adding the 5 Euro taxi ride voucher they add on top (any cab?) and the free drink (any bar?) It seems a scam to me. Maybe I'm wrong and they offer some service worth a 3 Euro fee.