Hello Maria, Thank you for your question. You can call the day of if you wish or up to a month before. Guided tours are capped at 10 people each tour but self- guided tours are done on a walk-in basis. Please let us know if you need more information. We look forward to seeing you soon!
If you want to have a specific time for a tour I would call about a week ahead. Tours fill up quickly but the number of visitors fluctuate quite a bit.
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