Hell, according to Christian mythology, is pretty clearly described in the Bible as a fairly unpleasant place consisting of fire and lakes of molten sulphur. Hel, with one 'l', on the other hand is described as equally unpleasant, however it is the cold icy abode of the goddess of the same name in Norse mythology. In Hellenism, Hades is described as not unpleasant at all, but not particularly fun either; the dead exist as shades, not suffering any torment but incapable of attaining any joy or glory, to the extent that the ghost of Achilles remarked that it was fair better to be the poorest of the poor in life than to be a king in Hades. Tartarus, on the other hand, was quite nasty, with individualised punishments doled out to particular wrongdoers - for instance, Sisyphus was condemned to spend eternity rolling a boulder up a hill, and Tantalus was sentenced to spend eternity in perpetual hunger and thirst, with food and water just out of reach. And as for Duat, the Kemetic underworld, that was the realm where Ra had to pass through every night, which was inhabited by demons, most notable among them Apophis. The dead would have to navigate through this perilous realm, aided by spells from the Book of the Dead, before being judged by Anubis, where if they passed they would be allowed to join Osiris in the realm of Aaru.