With its rich history full of historical buildings and ancient streets, its outstanding museums and galleries, Copenhagen has a host of attractions to suit all tastes. The Little Mermaid (from Hans Christian Andersen's fairy tale) is the most popular tourist attraction in Denmark and one of the most photographed statues in the world. Amalienborg Palace is the royal family's winter residence, it is a major architectural work and probably the most outstanding piece of Rococo architecture in Denmark. It comprises four palaces and was originally conceived as town mansions for families of the nobility at the beginning of the 1750s. Statens Museum for Kunst, the Danish national gallery, is the only place in Denmark which features 700 years of Western art and cultural history under one roof. The museum houses a large collection of Danish and international paintings, sculptures, drawings, and installations. The National Museum is Denmark's largest museum of cultural history. The museum's main domicile is a classical 18th century mansion. The Round Tower was built on the initiative of King Christian IV (1588-1648). The tower was the first stage of the Trinitatis complex, which was to gather three important facilities for the scholars of the seventeenth century: an astronomical observatory, a student's church and a university library. The tower was completed in 1642.