You can buy a ticket for each museum you visit, but you can also choose to purchase a Museumkaart, which provides free access to approximately 400 museums all over the country. The price of this card for one year is € 65, or € 32½ for persons aged 18 years or younger.
When you buy a Museumkaart at one of the participating museums, you will receive a temporary card that is valid for 31 days from the day of purchase. You need to register in order to get a personalized card that is valid for the rest of the year. Registration is possible only if you have a Dutch address; you will receive your card within five working days after registration. (Registered cards can be renewed after a year at a € 5 discount.)
A ticket for the Rijksmuseum costs € 20 and admission to the Dutch Open Air Museum is € 19; smaller museums will charge you around € 10 for a visit. On average, the purchase of a Museumkaart is advantageous after four or five museum visits.