Artemis, the goddess of hunting and the keeper of forests and hills, was worshipped throughout the Hellenic world. Her best known cults were in the island of Delos (her birthplace); in Attica at Brauron and Mounikhia (near Piraeus); and in Sparta. She was often depicted in paintings and statues in a forest setting, carrying a bow and arrows and accompanied by a deer.
She gradually displaced Selene (the titaness of the moon) as goddess of the moon.
In Ionia the "Lady of Ephesus", a goddess whom Hellenes identified with Artemis, was a principal deity. Her temple at Ephesus (an ancient Greek city located in western part of Turkey), one of the Seven Wonders of the World, was probably the best known center of her worship apart from Delos. In Acts of the Apostles, the Ephesian metalsmiths who feel threatened by Paul’s preaching of the new faith, jealously riot in her defense, shouting "Great is Artemis of the Ephesians!" (Acts 19:28 KJV).
Athenian festivals in honor of Artemis include Elaphebolia, Mounikhia, Kharisteria, Brauronia; the festival of Artemis Orthia was observed in Sparta.
Pre-pubescent Athenian girls young Athenian girls approaching marriageable age were sent to the sanctuary of Artemis at Brauron to serve the Goddess for one year. During this time the girls were known as arktoi, or little she-bears. A myth explaining this servitude relates that a bear had formed the habit of regularly visiting the town of Brauron, and the people there fed it, so that over time the bear became tame. A young girl teased the bear, and, in some versions of the myth it killed her, while in other versions it clawed her eyes out. Either way, the girl’s brothers killed the bear, and Artemis was enraged. She demanded that young girls "act the bear" at her sanctuary in atonement for the bear’s death.
Virginal Artemis was worshipped as a fertility/childbirth goddess in some places, assimilating Ilithyia, since, according to some myths, she assisted her mother in the delivery of her twin. During the Classical period in Athens, she was identified with Hecate. Artemis also assimilated Caryatis (Carya).
more: http://en.wikipedia.org/wiki/Artemis