Cluj-Napoca, the fourth-most populous city in Romania, is located in the Someșul Mic river valley and serves as the unofficial capital of Transylvania. Historically significant, it has served as the capital of the Grand Principality of Transylvania and features notable sites like the Gothic-style St. Michael's Church and the Bánffy Palace. The city has a diverse industrial base, producing goods such as refrigeration equipment and footwear.