The focal point of Plac Trzech Krzyży (Three Crosses Square), St. Alexander's Church is modelled on the Roman Pantheon, this church boasts a sculpture of Christ that dates from the 18th century. It was here that Allied secret agents met during WWII. The church's lower level is used for services for deaf mutes. Father Jakub Falkowski, parish priest of St. Alexander's, founded the nearby Institute of Deaf Mutes and the Blind. There is also a Belarussian mass held every 4th Sunday of the month at 18:00.