Mahakal, Ujjain (or Avanti) in Madhya Pradesh is home to the Mahakaleshwar Jyotirlinga temple. The Lingam at Mahakal is believed to be Swayambhu, the only one of the 12 Jyotirlingams to be so

Jyotirlingam # 3

Mahakal, Ujjain (or Avanti) in Madhya Pradesh is home to the Mahakaleshwar Jyotirlinga temple. The Lingam at Mahakal is believed to be Swayambhu, the only one of the 12 Jyotirlingams to be so. It is also the only one facing south and also the temple to have a Shree Yantra perched upside down at the ceiling of the Garbhagriha (where the Shiv Lingam sits). It is a place where Shakti peeta and Jyotirlingam are together.