St. Nicholas Church at the northwest corner of Old Town Square
This church and the St Nicholaus Cathedral in Malá Strana were both designed by Kilián Ignác Dienzenhofer in the Baroque style. But unlike its more famous counterpart, this church felt into tough time and was closed. In 1871, it reopened as a Russian Orthodox Church.
Now, like most churches in Prague, it holds nightly classical music concerts for tourists. There is a ticket booth at its entrance.