Zagori is an area of great natural beauty, with striking geology and two National Parks, one including the river Aoos and the Vikos Gorge, the other around Valia Kalda, to the east of the imposing snow-capped Mt Tymphe. The 46 or so villages of Zagori were interconnected by mountain roads and traditional arched stone bridges until modern roads were opened in the 1950s. The stone arched bridges were built by benefactions from expatriate merchants in the 18th century and replaced older wooden bridges.