DENIZLI, TURKEY - JANUARY 6: A tourist swimming in the Cleopatra's Pool in the ruins of ancient city of Hierapolis at the UNESCO World Heritage Site of Pamukkale in Denizli, Turkey on January 6, 2017. ( Servet Ülkü - Anadolu Agency )
DENIZLI, TURKEY - JANUARY 6: A drone photo shows Hierapolis Ancient Theater at the UNESCO World Heritage Site of Pamukkale in Denizli, Turkey on January 6, 2017. ( Cem Öksüz - Anadolu Agency )
DENIZLI, TURKEY - JANUARY 6: A tourist swimming in the Cleopatra's Pool in the ruins of ancient city of Hierapolis at the UNESCO World Heritage Site of Pamukkale in Denizli, Turkey on January 6, 2017. ( Cem Öksüz - Anadolu Agency )
DENIZLI, TURKEY - JANUARY 6: Tourists swimming in the Cleopatra's Pool in the ruins of ancient city of Hierapolis at the UNESCO World Heritage Site of Pamukkale in Denizli, Turkey on January 6, 2017. ( Cem Öksüz - Anadolu Agency )
DENIZLI, TURKEY - JANUARY 6: A drone photo shows tourists enjoying the hot spring travertine pools and terraces at the UNESCO World Heritage Site of Pamukkale in Denizli, Turkey on January 6, 2017. Warm water at a temperature of 33-36 containing calcium hydro carbonate springing from 320 meters depth appears on the surface and water falls into terraces and forms the travertines. ( Cem Öksüz - Anadolu Agency )
DENIZLI, TURKEY - JANUARY 6: A drone photo shows a hot air balloon flying over the UNESCO World Heritage Site of Pamukkale in Denizli, Turkey on January 6, 2017. Warm water at a temperature of 33-36 containing calcium hydro carbonate springing from 320 meters depth appears on the surface and water falls into terraces and forms the travertines. ( Cem Öksüz - Anadolu Agency )
DENIZLI, TURKEY - JANUARY 6: A drone photo shows tourists enjoying the hot spring travertine pools and terraces at the UNESCO World Heritage Site of Pamukkale in Denizli, Turkey on January 6, 2017. Warm water at a temperature of 33-36 containing calcium hydro carbonate springing from 320 meters depth appears on the surface and water falls into terraces and forms the travertines. ( Cem Öksüz - Anadolu Agency )
DENIZLI, TURKEY - JANUARY 6: Tourists enjoying the hot spring travertine pools and terraces at the UNESCO World Heritage Site of Pamukkale in Denizli, Turkey on January 6, 2017. Warm water at a temperature of 33-36 containing calcium hydro carbonate springing from 320 meters depth appears on the surface and water falls into terraces and forms the travertines. ( Cem Öksüz - Anadolu Agency )

