In addition, the Colts left an indelible imprint on Hartford's architectural environment. Samuel Colt was inspired by what he had seen during a trip to London in 1851, and he embarked upon one of the boldest real estate development campaigns in Hartford's history. His intention was to build an industrial community to house his workers adjacent to the Colt Armory. By 1856, it was a city within a city, where workers of many nationalities and religions worked and lived alongside one another. Coltsville was among the first of America's 19th century company towns, and it was easily the most advanced of its time—though not the largest, the most prominent, or the most tightly controlled. Colt's complex also included the largest armory in the world, as well as wharf and ferry facilities on the Connecticut River.