The Academy is located in "Heaven". "Heaven is a dimentional hole in the Earths Universe. It is believed that this "Heaven" was the home to the Gods and Goddesses of the old world. There is no Specific Enterance into the Heavens. A portal or a doorway can only be created by one of the goddesses.
Lunare Founded the Goddess Academy to help save the world. She has witnessed all the changes and destructions it has held. Lunare feels the Earths Pain,and therefor vowed to help erstore its peace and serenity. Thus Creating the Goddess Academy.