Plutonium
Plutonium was a sacred place of the ancient city of Hierapolis in Turkey, dedicated to Pluto, the Roman god of the underworld. It used to be very famous because of its lethal fumes (the primary component is carbon dioxide) exhaled from it, killing all the animals or birds with the courage to approach the opening. While other species died from the fumes, priests of the time would demonstrate their divine protection by entering the cave and returning unharmed. In this sense, the Plutonium embodies elements of the underworld that are mysterious and threatening and served as a place of ritual and religious refuge.
