Visitors to Basilica Cistern can step into one of Istanbul’s most fascinating underground landmarks and experience the mysterious atmosphere of this ancient water reservoir built during the Byzantine Empire. They can walk along elevated pathways between hundreds of impressive marble columns, admire the dramatic lighting and reflections on the water, and learn about the engineering brilliance that once supplied water to the Great Palace of Constantinople. Travelers can also discover the famous Medusa head column bases, take stunning photographs in the unique setting, and enjoy a peaceful yet unforgettable journey beneath the busy streets of Istanbul.