The Mutter Museum in Philly.
While not the largest, the Bishop Museum in Hawaii (island of Oahu) . It's focused on Hawaiian history. Amazing stuff.
Good list! I'm going with fairs and festivals. They've both got lots to see and do. Here's our local fair. Excellent rock and country music concerts!
I won't attend circuses. I don't believe in exploiting animals for entertainment and profit.
Festivals are lot's of fun and good entertainment !