A superb example of high baroque architecture, St. Nicholas Church is as impressive inside as it is from the outside. The interior was said to have been inspired by the chapel of St. Louis-des-Invalides in Paris: its intricate frescoes, grand sculptures, and elegant stucco designs make it a striking place to visit either independently or as part of a larger walking tour of Prague. The dome has an impressive diameter of 66 feet (20 meters), and it has the highest interior (over 160 feet or 49 meters) in Prague. The church’s main organ—once played by Mozart—is 20 feet (six meters) long and features more than 4,000 pipes.
Some Prague walking tours only visit the exterior of the church, but, if you want a closer look at the spectacular interior, you can join a tour that includes a tour inside.