Baltimore City Hall and Its Unlikely Dome

The building at the center of Baltimore's government district has a dome that almost no one expected, designed by a man most people had never heard of.

In eighteen sixty-seven, Baltimore held a design competition for a new city hall. The winner was George A. Frederick, who was twenty-two years old when his plans were selected. Two years later Frederick was hired to supervise construction himself. The building that rose over the next eight years became one of the finest examples of Second Empire architecture in the United States, a style that dominated American public buildings in the decades just after the Civil War, marked by steeply pitched mansard roofs, dormer windows, and corner pavilions with elaborate cornices.

When Baltimore City Hall was completed in eighteen seventy-five, its cast-iron dome stood two hundred twenty-seven feet above the street. The dome was engineered by Wendel Bollman, a largely self-taught Baltimore engineer who had already made his name with the Bollman Truss Bridge, a patented iron bridge design that solved the problem of long railroad spans in the eighteen fifties. Bollman's dome was fabricated of cast iron.

The connection to the Capitol dome is worth pausing on. Both domes were cast iron. Both belong to the same era, when American cities were signaling permanence and ambition through their public buildings. Baltimore's dome is smaller, but in its craftsmanship and in the story of its making, it belongs to the same tradition.

City Hall has been a working government building continuously since its completion. The mayor's office, the city council chambers, and the records of Baltimore's civic life have all lived here. The building was restored in the nineteen seventies and remains listed on the National Register of Historic Places, a Second Empire landmark still doing the job it was built to do.