both the ground and first floor. The structural elements of a building primarily consist of load-bearing brick and stone masonry walls and piers supporting steel-framed floor and roof systems. Care given in the construction of the original structure was so great that even far removed mechanical spaces not intended to be seen by the public were designed and built with a high standard of finish and design. Building Dimensions East to west, the Capitol is more than long. From ground level to the top of the dome's lantern measures . Inside, the building has more than of floor space, or about of space. Dome The Minnesota State Capitol dome is the second largest self-supported marble dome in the world, behind Saint Peter's Basilica in the Vatican, on which Gilbert based his design. The dome itself is actually made up of three domes or layers. The outer layer is a self-supporting dome made of Georgia marble blocks resting upon their own weight. Hidden inside is a brick and steel cone that supports the lantern and golden sphere at the top of the dome and provides an internal water drainage system, which helps avoid the heaving problem created by the freezing and thawing of Minnesota winters. Below that is the decorative masonry dome that can be seen from the inside, looking up from the rotunda. At the dome's base are 12 marble eagles paired with the columns surrounding the drum of the dome. At the dome's top is a columned stone lantern which is then topped by a finial globe covered in gold leaf. Stone Because it was just over 30 years after the American Civil War when the building was designed, Gilbert drew ire for choosing marble from Georgia rather than native Minnesota granite for the exterior. Gilbert insisted on using Georgia white marble, saying that the use of a darker color would make it look "glooming and forbidding." A compromise was made with native granite for the steps and the base and interior walls of Kasota limestone, while using the Georgia white marble for the vast majority of the buildings’ exterior. The steps of the two grand staircases in the east and west wings of the Capitol are made of Hauteville limestone, which resembles the Kasota limestone used through the walls of the Capitol but can take more wear. The 36 variegated columns surrounding the grand staircases are made from