Hierapolis is an ancient city located in modern-day Turkey, near the hot springs of Pamukkale. Founded in the 2nd century BC, it became a popular spa destination due to its thermal waters, which were believed to have healing properties. The city was known for its impressive architecture, including temples, theaters, and a large necropolis. The ruins of Hierapolis are part of a UNESCO World Heritage Site, showcasing well-preserved structures like the Theatre and the Basilica. Visitors can explore the ancient streets and enjoy the stunning views of the surrounding landscape, making it a significant historical and cultural site.