The Apollo Temple in Hierapolis, Pamukkale, is a magnificent relic dedicated to the Greek god Apollo. Built in the 3rd century BC, this sanctuary stands over a sacred cave believed to be the Plutonium, the entrance to the underworld. The temple’s remains, including its partially preserved columns and foundations, highlight the city’s religious significance and its fusion of Greco-Roman architectural styles. Visitors can explore the temple area, which offers a glimpse into ancient spiritual practices and the prominence of Apollo worship in Hierapolis.