The Skirball is completely free for all visitors every Thursday!  What’s the catch?  No catch, but definitely a tip: advance tickets are highly recommended well in advance for all visitors who plan on visiting Noah’s Ark.  To ensure a safe and pleasant visitor experience, all Noah’s Ark ticketholders are assigned an entry time, permitting up to two hours in the Noah’s galleries. These tickets are quite popular, so if you’d like to visit Noah’s Ark, check in on Monday, as soon as Thursday reservations become available.  (All other galleries and exhibits are free every Thursday, and those don’t require advance reservations.)