Stolobny Island is the home of Nilov Monastery, which was founded by Saint Nilus in 1594, and previously welcomed up to 40,000 pilgrims each year. Most of the buildings of the monastery were built in the 18th and 19th Centuries in a neoclassical style. Today the monastery complex remains one of the most impressive ensembles of Neoclassical architecture in Eastern Europe. Some of its churches date back to the 17th century. A graceful embankment was completed by 1812, and a large cathedral was built in 1821-25. The construction of the causeway to the island was completed in 1812. The Nilow Monastery was one of the largest and wealthiest monasteries in the Russian Empire.
In 1919, after the October Revolution, the monastery was confiscated. It was closed in 1927 by the Soviet government and subsequently used for various purposes. From 1927 to 1939 there was a work camp for underage criminals.
In the period 1939 to 1941, during the first years of World War II, the monastery was a prisoner of war camp of the Russian secret service NKVD, which held approximately 7,000 Polish prisoners of war who had been taken captive by the Soviet Union as a result of the Molotov-Ribbentrop Pact. Almost all of the prisoners were subsequently executed in April 1940 in Kalinin (now Tver) and then buried in mass graves in Mednoye, an act which became known as the Katyn Massacre. Amongst those killed were Polish officers, lawyers, policemen, teachers, doctors, and other members of the intelligentsia.
From 1941 to 1945 there was a hospital in the building complex, and again from 1945 to 1960, a camp for minors and orphans. From 1960 to 1971 the monastery was used as a retirement home, and from 1971 to 1990 a hostel for tourists.
References:The Clementinum is a historic complex of buildings in Prague. Until recently the complex hosted the National, University and Technical libraries, the City Library also being located nearby on Mariánské Náměstí. The Technical library and the Municipal library have moved to the Prague National Technical Library at Technická 6 since 2009. It is currently in use as the National Library of the Czech Republic.
Its history dates from the existence of a chapel dedicated to Saint Clement in the 11th century. A Dominican monastery was founded in the medieval period, which was transformed in 1556 to a Jesuit college. In 1622 the Jesuits transferred the library of Charles University to the Klementinum, and the college was merged with the University in 1654. The Jesuits remained until 1773, when the Klementinum was established as an observatory, library, and university by the Empress Maria Theresa of Austria.