The Garden of Forking Ways is the realm of Destiny of the Endless.
History
Located beyond the boundaries of normal space, the Garden is a strange, ever-changing landscape, traversed by paths that fork, divide and reconnect. Sometimes it may look like a hedge maze, labyrinthine ancient ruins, a vast sandy desert or something completely different.
Destiny is the only one who understands the Garden's geography and he hardly receives visitors unless he calls for them. When he needed to someone to protect the Book of Souls from the Luck Lords he warped Supergirl in, sending her back to real space afterwards.[1]
Sometimes Destiny is visited by other cosmic principles like the Three Witches. He also uses his mansion in the Garden to hold meetings with his siblings.[2]
Would-be trespassers are doomed to wander the Garden until their deaths. Lobo is the only mortal being known to find his way through the Garden thanks to his tracking power leading him straight to Destiny.