I can see where this place can get a bit boring after 2 or more visits. But if you've never been, it's definitely a bit of L.A. history that different from the rest. If you're on a budget, make a picnic basket and people watch on the lawn outside. Parking is free if you can find it. If not, you can park in a lot close by for $5.
Pros: Learning Value, Cheap, Exhibits
Cons: parking can be a pain
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