Either is fine but at the door is the best option they will often help you get a better price through discounts
At the door they try to give you as many discounts as they can.
Yes
I've never seen a big line at the door. Just do it there. Plus you want to talj with them anyways in case something special is happening.
The door
Purchasing at the door is just fine for this museum. It's small enough there's not often a line, and they are great about getting you the best deals on admission.
Either is fine.
By
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