 At Cheltenham he laid out the Montpellier Estate, and extended the Montpellier Pump Room (1825–26), with a domed rotunda inspired by the Pantheon.In 1827 William Bullock commissioned Papworth to plan the layout and design various classes of building for a new city to be called "Hygeia" in the United States, on land he had bought stretching about two-and-a-half miles along the Ohio River, opposite Cincinnati.Bullock published the plans, hoping to attract purchasers for the plots, but the scheme came to nothing.