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In page Columbus, Ohio:

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Construction of the Ohio Statehouse began in 1839 on a 10-acre (4 ha) plot of land donated by four prominent Columbus landowners. This plot formed Capitol Square, which was not part of the city's original layout. Built of Columbus limestone from the Marble Cliff Quarry Co., the Statehouse stands on foundations 18 feet (5.5 m) deep, laid by prison labor gangs rumored to have been composed largely of masons jailed for minor infractions.[1] It features a central recessed porch with a colonnade of a forthright and primitive Greek Doric mode. A broad and low central pediment supports the windowed astylar drum under an invisibly low saucer dome that lights the interior rotunda. There are several artworks within and outside the building, including the William McKinley Monument dedicated in 1907.