One of the many embassies that lives on Massachusetts Avenue in the Dupont Circle neighborhood, the Uzbekistan Embassy cuts out of the stretch as a Beaux Arts beauty, with limestone balustrades, windows with corbels and guttae. The mansion once belonged to a coal magnate who drowned with the Titanic, and later became the Canadian embassy, now the Uzbekistan Embassy. The mansion, designed by architects Bruce Price and Jules Henri de Sibour, who designed many prominent…