 Apart from the architecture of the California missions and other colonial buildings, there are still many architectonic reminiscences of the Spanish period, especially in Southern California, where white stucco walls, red roof tiles, curvilinear gables, arched windows, balconies or even bell towers are incorporated into modern building styles in what is known as the Spanish Colonial Revival architecture, a United States architectural stylistic movement that came about in the early 20th century.While Spanish architectural styles appear statewide, Northern Californian cities more prominently feature historic Victorian architecture, for which San Francisco is renowned, but which dominates the central historic districts of most Northern California towns.The towns of Eureka and Ferndale, in Humboldt County, are particularly noteworthy for their well-preserved Victorian building stock.