Ujjain is not only a city of Mahakaleshwar but also is a residing place of 84 Mahadeva, these ancient 84 temples of Mahadeva have special place in worship during the time of Shravan-Bhadau month (purshottam maas too),
According to Skanda Purana, we after visiting 84 lakh yonies or forms, finally take birth as human, while visiting the 84 lakh yonies before being human, whatever sins, bad karma or deeds we have done in those yonies are resolved and nullified by visiting the 84 Mahadeva temples during Shravan Maas, providing us chance to start again, but only if we continue good karma we will be given next yoni as human,
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Jai Shri Mahakaal