Every state capitol built before WWI has a dome. The Iowa State Capitol in Des Moines is unique because it has five. The main one rises 275 feet with 23-karat gold leaf over its brick and steel structure. The smaller ones are copper, now green from weathering, with vertical braids of gold. The rest of the structure is sandstone and granite with elegant columns, carvings and arched windows. This exquisite landmark was completed in 1886. Iowa became the 29th state on December 28, 1846.