Built between 1742 and 1758, the baroque-style Holy Trinity Church has a dazzling gilded rococo interior. Its centrepiece is its fabulous organ, at one time the world's largest, boasting more than 7000 pipes, 131 registers and four manuals. For a small fee, the church caretaker will escort you up the myriad of creaky wooden steps to the clock tower, where fabulous city views await.
