One of the holiest cities for Hindus, Ujjain is the city of temples housing renowned temples likeMahakaleshwar and KalBhairav. It is also one of the 4 cities which host the MahaKumbhMela every 12 years, an estimated 100 million people attend this mela, making this one of the highest pilgrim attendances at a single place all over the world. This city possesses such great energy that it fills you up with positive vibes.