It is said that when he was tired of rampaging across the earth, Ravana returned to Lord Shiva to request moksha, release from the bondage of endless rebirth. Shiva replied that he had granted Ravana the boon of indestructibility, and that Ravana must instead seek moksha from Lord Vishnu(According to srimadbhagavatam chanto4 chapter6 verses 43 to 50 it is clear that shiva is ordaining jivas to spiritual world and heavens etc. So shiva can give liberation to any one. But ravana was jaya who is guarding the entrance of lord vishnu's residence and cursed by four sons of brahma and his destiny lies in the hands of lord vishnu). In this version of Ravana's story, his battle with Rama can be interpreted as a pretext to attain death, and through death, liberation. Ravana's poignant cry in the final quatrain of poetry — "When will I be happy?" is echoed by modern man in his quest for earthly fulfillment and ultimate liberation from its bondage.
A compelling and complex personality, Ravana is for many Hindus a legendary hero, a scholar of immense intelligence and the devoted husband of one of traditional five perfect women, Mandodari.Ravana married Maya's daughter, Mandodari, who was a very beautiful & righteous wife. He had a son by her, named Meghanaada (which means the 'sound of the clouds' or the 'sound of thunder'). Meghanaada defeated Indra, the king of gods, and earned the title of 'Indrajit'. Ravana's great-grandfather was Brahma (God of Ultimate Knowledge). He had advanced knowledge of mathematics, science and Ayurveda.
He was obsessed with his powers and was egoistic, and to display and prove his powers he was about to move Mount Kailash (the abode of Shiva who was his ancestor god). He managed to lift the mountain but Shiva immediately placed it back just by pressing his toe crushing Ravana's fingers in the process. That is when Ravana sings "Tandav Stotra" and he was spared and blessed with chandrahas (moon sword by Lord Shiva) considered one of the most powerful weapons in Hindu Mythology.