We had no clue that the museum existed until we saw it on TV a few months back.
It is free of charge and open approx. 10 days/month. (1st and 3rd Saturdays and Wed and Thurs from 11-4). Look at their web site to see if it is something for you.
We usually shy away from La Jolla, in general, as the parking is notoriously difficult. If you can find them, most parking spots are just one or two hour (with enforcement making frequent drive-bys) so we found a parking lot just off Wall St, paid $6 and walked a few blocks.
The museum is located one floor down in a modern development, which also houses the La Jolla Sports club and some cafes. It is easily accessible by stairs or a large lift.
A treasure trove of exquisite quality maps and atlases which are owned by a private individual who very generously makes them available to the public. The lady on duty greeted each visitor, explained the layout of the small museum and offered the use of a hand-held magnifying glass. I have good vision but was very glad I borrowed one, as much of the ancient print is very small.
The maps date from the 1950s (a special exhibition of Mora posters/maps) as far back as the 1400’s (the majority of them are in the range 1400-1600’s). Each is accompanied by a short explanation, written in easy to understand terms.
My favorite was the 4 ft diameter San Zeno Astrolabe, probably because I wasn’t expecting it.
The museum offers special events and tours. We were not hassled for donations (I’m not sure if they even took them) and happily completed the guest book.
I am certainly going to keep it on my radar for future visits.