On Vacation Guide Book Prague | Page 46

1 .   S T N I C H O L A S C H U R C H MALOSTRANSKÉ NÁM Ě STÍ The Church of St Nicholas , the most famous Baroque church in Prague , stands along with the former Jesuit college in the centre of the Lesser Town Square . A Gothic parish church consecrated by Prague Bishop Tobiáš in 1283 stood at the site until 1743 ; nearby was the Romanesque Rotunda of St Wenceslas , which had been built in memory of the miracle that occurred during the transfer of Wenceslas ’ body from Stará Boleslav to Prague Castle , as mentioned in medieval legends . Today ’ s Church of St Nicholas is one of the most valuable Baroque buildings north of the Alps . Construction lasted approximately one hundred years , and three generations of great Baroque architects – father , son and son - in - law – worked on the church : Kryštof Dientzenhofer , Kilián Ignác Dientzenhofer and Anselmo Lurago . The Jesuit Thomas Schwarz built the small and main organs as well as many others in Bohemia . Built in 1745 - 47 , the main organ has over 4 , 000 pipes up to six metres in length . W . A . Mozart played this organ during his stay in Prague as a guest of the Dušeks . The Church of St Nicholas is a superb example of High Baroque architecture , a building that astonishes visitors with its size and monumental interior . As the most prominent and distinctive landmark in the Lesser Town , no panoramic view of the city would be complete without its silhouette below Prague Castle .