Donostia developed into a fully-fledged seaside resort, while some industry was developed in the district of Antiguo and outskirts of the city. Following the outbreak of World War I, San Sebastián became an attracting focus for renowned international figures of culture and politics, e.g. Mata Hari, Leon Trotsky, Maurice Ravel, Romanones, etc. Various rationalist architectural landmarks, typically white or light toned, were erected and dotted the urban landscape in the 20s and 30s (La Equitativa, Nautico, building Easo, etc.). In 1924-1926, works to canalize the Urumea river were carried out on the southern tip of the city.