The Wisconsin State Capitol’s dome is the largest by volume in the U.S. The pinnacle rises 284 feet. This is only 3 ½ feet shy of the U.S. Capitol. The building was constructed from White Bethel Vermont granite and completed in 1917. The symmetry of its four, 187 foot long wings gives it a nearly consistent appearance from any direction. They are equally beautiful. Wisconsin became the 30th state on May 29, 1848.