- father and son Christophe and Kilian-Ignatz Diesenhofer.
Look and see the white organ where angels can climb up and down. Mozart played on this organ while he was staying in Prague, in 1787. The organ is working up to today during concerts that take place in the church.
The gold and marble decorated church is rich and impressive. With many decorations and a green dome, the church ceiling is awe inspiring. The impressive fresco, considered the largest fresco in Europe, adds to its beauty. The fresco describes scenes from the life of St. Nicholas.