The Greeks believed that when they die, they would be sent to the Underworld. It is said that there were three locations in the underworld and they were; Realm of Hades where the mortal souls could explore but only few got out alive, Tartarus where the damned and evil souls would suffer in eternity along with the Titans in the pits of Tartarus, and there was Elysium where those chosen by the Gods could leave in the afterlife happy and peacefully.
Below are images of the three locations of the Underworld.