Nymphaion (fire sanctuary)
Nymphaion (Ancient Greek: Νυμφαῖον, Nymphaîon) was the name given to the ancient sanctuary of the "eternal fire" located in southern Illyria, notably near Apollonia, in modern-day Albania. The location also featured bitumen mines, which, still functioning today, have held a crucial role throughout the history of the region.
Source: Wikipedia — Nymphaion (fire sanctuary) (CC BY-SA 4.0)