Obviously, you can check out the official website to see all the venues and the availabilities. Still, here are a few ideas:

One of the most interesting places to visit is the tower of the Oudekerk in the Red Light District. Additionally, it is not yet fully booked. Why? Because it comes on a first-come first-served basis. As a matter of fact, at 9:45, tickets will be handled to the visitors, giving an entry during the day. When all the tickets are given away, there is no hope to get up. The best advice is thus to arrive earlier than that time, as you can be sure that some people will be in line at least an hour before.

If your guests are not the fittest for long lines and steep steps, Then the Silver Tower is the perfect match! You know, that big tower on the side of Central Station? First of all, there is an elevator, but on top of that, you will access for free the eleventh floor and have a 360° view of Amsterdam. Wat leuk!

As you can imagine, having an “Open Tower Day” meant that the Adam Tower had to be part of it too! They are not free, unfortunately, but if you follow this link, you will get a 5€ voucher for that very special day!