On Wednesdays it is free, if you go on other days there are two tickets, one restricted and the other unlimited, I recommend the unlimited
Wednesdays are free but you have to get up early to get your free tickets because they only give them for half an hour, arrive before 10AM
And
There are 2 prices on the tickets. If you only visit that place the unlimited is the right thing to do.
Wednesdays are free
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