St Nicholas is a Baroque church built at a scale that is hard to take in from the floor. Jan Lukáš Kracker painted the life of St Nicholas across the nave vault in one continuous scene, and František Xaver Palko filled the dome seventy metres above your head. The organ carries more than four thousand pipes, the largest of them six metres long, and Mozart played it in 1787. The bell tower beside the church is a separate building with a separate owner.
The tower belongs to the city rather than to the church, and after 1925 the rooms inside it were let as an ordinary flat. From 1964 to 1990 the secret police used one near the top to watch the American, West German and British embassies in the streets below. You pass it on the way up: 215 steps to a gallery at sixty-five metres, with the roofs of Malá Strana underneath. The Jesuits raised the church itself between 1703 and 1752, under three architects from one family.