Years ago, Claudia visited the Garden of Innocence as a child. When she, Aaravos and Terry visited the Puzzle House, Terry was the only one who could read the map because of the three mages, Terry was the only one who still his retained his true heart and Claudia couldn't because she was no longer a child anymore. ("Death Alive", "True Heart").
However it was secretly a final resting place for Unicorns, which what's proven when Claudia used some kind of magic spell to collect all the bones of a unicorn so she can make a Moon Primal Stone. ("The Glittering Bones")
