Also there are different types of tours. There are guided tours through each room, as well as times where you can walk through at your leisure and there's someone posted in each room to answer questions.
Check the website for tour types and frequency. Last house tour starts at 4 PM. Buy your tickets online to ensure that you have a spot.
Tours can start as often as every 15 minutes. Best to reserve online where it shows how many places are left in each tour. Also there are several different themes of tours.
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