A large grove, a Doric temple (remains of which survive),[4] and a cave called the Charonium, were the seat of the oracle.

Strabo noted that "The sick resort thither, and live in the village near the cave, among experienced priests, who sleep at night in the open air and direct the mode of cure by their dreams.

The priests invoke the gods to cure the sick, and frequently take them into the cave, where they remain in quiet without food for several days.

An annual festival, to which there is general resort, is celebrated at Acharaca, and at the time particularly are to be seen and heard those who frequent it, conversing about cures performed there.

During this feast the young men of the gymnasium and the ephebi, naked and anointed with oil, carry off a bull by stealth at midnight, and hurry it away into the cave.