Mahakaleshwar temple at Ujjain is an important pilgrimage place for Hindus as it's said to be one of the 12 Jyotirlingas. It's also regarded as one of the top 10 Tantra temples of India, and has the only Bhasm-Aarti (ash ritual) of its kind in the world.
An ancient city situated on the eastern bank of the Kshipra River, Ujjain was the most prominent city on the Malwa plateau of central India for much of its history. It emerged as the political centre of central India around 600 BCE. It was the capital of the ancient Avanti kingdom, one of the sixteen mahajanapadas. It is an important place of pilgrimage for Shaivites, Vaishnavites and followers of Shakta. It is a known Hindu pilgrimage centre with the Kumbh Mela held here every 12 years.
It can only be termed as a blessing, by Lords and mother nature, that Omkareshwar, the sacred island called Mandhata or Shivapuri in the Narmada river, is shaped like ॐ (Om) - the holiest symbol of Hinduism. Not surprising then that this serene town is also one of the 12 Jyotirlinga shrines in India. Pilgrims in unimaginable numbers visit the shrine every year, seeking the blessings of Lord Shiva.