The Vasa (Wasa) Museum (Vasamuseet) is a maritime museum in Stockholm, Sweden. Located on the island of Djurgården, the museum displays the only intact 17th-century ship, the Vasa, an elaborately ornamented Swedish galleon that sank on the maiden voyage in 1628. The Vasa Museum opened in 1990 and, according to claims on the official web site, is the most visited museum in Scandinavia. After the newly raised Vasa had been towed into the Gustav V drydock in Sweden's naval shipyard in Stockholm in April 1961, she was put down on a specially built floating pontoon on which a superstructure made of aluminum sheets was built. The temporary building, Wasavarvet, was intended as a space for the preservation treatment but it was also equipped with visitor galleries in two levels around the walls inside the housing.