Pamukkale, meaning "cotton castle" in Turkish, is a natural site in Denizli Province in southwestern Turkey. It is famous for its white terraces of travertine, a carbonate mineral left by the flowing water. Adjacent to Pamukkale is Hierapolis, an ancient Hellenistic city founded by the Attalid kings of Pergamon in the $2^{nd}$ century BC. The site was later transformed into a Roman spa town. Among its most significant structures are the well-preserved Roman theatre, the Temple of Apollo, and the large necropolis. The hot springs of Hierapolis were believed to have healing properties, attracting many visitors throughout history. Both Pamukkale and Hierapolis were designated a UNESCO World Heritage Site in $1988$.
Metne göre, Hierapolis'in hangi özelliği onu tarih boyunca birçok ziyaretçi için çekici kılmıştır?
A) Pamukkale'nin beyaz travertenleri
B) Pergamon kralları tarafından kurulmuş olması
C) İyi korunmuş Roma tiyatrosu
D) Şifalı olduğuna inanılan sıcak su kaynakları
E) $1988$'de UNESCO Dünya Mirası Alanı ilan edilmesi
