Italian colonists in the Dodecanese point for the spread of Italian culture in Greece and the Levant. The Fascist program did have some positive effects in its attempts to modernize the islands, resulting in the eradication of malaria, the construction of hospitals, aqueducts, a power plant to provide Rhodes' capital with electric lighting and the establishment of the Dodecanese Cadastre. The main castle of the Knights of St. John was also rebuilt. The concrete-dominated architectural style blended in with the islands' picturesque scenery (and also reminded the inhabitants of Italian rule), but has consequently been largely demolished or remodeled, apart from the famous example of
Symi the peculiarly colorful neoclassical mansions covering the slopes near the main city date from that period. Although Symiots took part in the Greek War of Independence of 1821–1829, it was left out of the new Greek state when its borders were drawn up and so remained under Ottoman rule. The island, along with the rest of the Dodecanese, changed hands several times in the 20th century: in 1912 the Dodecanese declared independence from the Ottomans as the Federation of the Dodecanese Islands, though they were almost immediately occupied by Italy. The island was formally ceded to Italy in 1923, and