The 14th-century Church of the Holy Spirit is an impressive building inside and out, and this radiant white church with its distinctive octagonal tower is located just off Town Hall Square. The clock painted on its front is the oldest public clock in Tallinn, dating from the late 17th century. Don't miss the carved wooden interior that includes treasures like a unique 15th-century altarpiece by famous Lübeck artist Bernt Notke, and one of Estonia's oldest pulpits dating back to 1597.