A new challenge for 2024? Perhaps.
Our first list came from a simple query. google 
pages/portland-museums
We start with just some lists in text files since we are not sure where we want to go with this. Page per site? Only after visit? Beyond Portland? Lifetime from memory?
# Lists
Travel Portland is a private not for profit Destination Marketing and Management Organization. list
TripAdvisor: Oregon >> Portland >> Things to Do in Portland >> Museums in Portland. list
Wikipedia's List of Museums in Portland. list
Portland Magazine's Ten Must-Visit Museums. list
Amsterdam based WhichMuseum. list
USA Today's Best Museums in Portland. list
Google Arts & Culture. map