Gustavianum is the former main building of Uppsala University, built 1622–1625. The name Gustavianum comes from Gustavus Adolphus who in the 1620s donated money for its construction. The Gustavianum was Uppsala University’s previous main building, until the completion of the University Hall in 1887. Since 1997 it has functioned as the home for Uppsala University’s museum - Museum Gustavianum. Under the cupola is the theatrum anatomicum, the second oldest in the world added to the building in the mid 17th century by Olaus Rudbeck, professor of medicine and amateur architect, among other things.