The Salzburg Museum incorporates seven branches, including the Toy Museum (Spielzeug Museum) and Museum of Natural History (Haus der Natur), but its main branch is at the Neue Residenz and is connected by subterranean tunnel to the adjacent Panorama Museum. The underground passage itself features a section of Roman wall covered with murals and models of the city at important points in its development but the main attraction of the Panorama Museum is the cyclorama of the city. Painted in 1829 by Johann Michael Sattler, the masterpiece painting-in-the-round is supremely impressive for its fine architectural and topographical detail and is 26 meters (85 feet) in diameter. Visitors stand on a central platform, from here telescopes and computer screens highlight various areas of the city, providing detailed descriptions of 19th-century Salzburg.