Histories Best Secret Keepers
Sources:
Mystery Cults in the Greek and Roman World - The Metropolitan Museum of Art
MYSTERY CULTS: THE ELEUSINIAN MYSTERIES
The Emergence of Mystery Cults in Ancient Rome and Greece – Lost Ledger (goes into Mystery Cults in Rome)
Ancient Greek Votive Offerings in Antiquity: Gifts to the Gods | Ancient & Oriental
The tragic myth of Orpheus and Eurydice - Brendan Pelsue
(14) Miscellaneous Myths: Dionysus - YouTube
The origin of the Eleusinian Mystery | Athens24.com
Demeter – Mythology Unbound: An Online Textbook for Classical Mythology
GREEK MYTHOLOGY: Orpheus and Eurydice - A Mortal Journey into the Underworld