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Tallinn, the capital of Estonia, was founded in the mid-11th century and was under Swedish, Russian and German rule. The city became a UNESCO World Heritage Site in 1997 as an exceptionally complete and well-preserved example of a medieval northern European trading city. Especially worth seeing outside downtown were for me: the Pirita Monastery dedicated to St. Birgitta, the area of the sailing competitions at the 1980 Olympic Games, the Kadriorg Palace, a summer residence of Peter the Great, and especially the Song Festival Ground, where every 5 years the largest choral events in the world takes place. In 2014, over 30,000 singers performed to an audience of 150,000.