The Italian Renaissance-style State Capitol building (1904) is an architectural masterpiece. Over two dozen varieties of marble, granite and sandstone were used in its construction and throughout the lavish interior. With an impressive display of statuary and flags, the rotunda and second level are a memorial to Minnesota Civil War volunteers. The crowning glory is the unsupported marble dome, which rises 73m (220ft) high. Its hilltop location affords sweeping views over the city and Mississippi River Valley. Guided tours are available.