Валаамский монастырь
It is best known as the site of the 14th century Valaam Monastery on Valaam Island and for its natural environment. In the 12th century, the islands were a part of the Novgorod Republic. In the 17th century, they were captured by Sweden during the Time of Troubles, but Russia reconquered them less than a century later. When the Grand Duchy of Finland was set up in the early 19th century as an autonomous part of the Russian Empire, Alexander I of Russia made Valaam a part of Finland. In 1917, Valaam became a part of newly independent Finland, but it was annexed by the USSR after the Winter War and Continuation War.