Blagaj Tekke is a 16th-century Sufi monastery built at the source of the Buna River, where emerald waters emerge from a cave beneath a 200-meter cliff. Constructed in 1520 for the Bektashi order, it represents one of the finest examples of Ottoman architecture in Bosnia. Dervishes continue their spiritual practices here. Visitors can explore the historic living quarters and enjoy Turkish tea at the riverside restaurant while watching the crystal-clear spring water flow past this mystical site.