The self guided tour gave me independence and let me avoid the large group of tourists. There was a lot of information and if you're not interested in a particular fact you can just move on. The tour was in and outdoors and not very strenuous. Nice bathrooms. I wished for more time in the hall itself, but they closed it up after the large tour went through and I was at the end of the day. Free entry with parking validation (park underneath just because it's easier than finding street parking).
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