This fall is going to be major for L.A. museums. Just take a look at our round-up of some of the exhibits opening this month, and you’ll get the idea. Admission fees to all those big museums can add up though, so it pays to keep an eye out for when each institution offers free entry days. Find a full rundown of all the free museum days in September in this comprehensive list from We Like LA. Also be sure to save September 22 on your calendar for the Smithsonian Magazine-sponsored national free museum day; 90 California museums are participating this year.