Adi Kumbeswarar Temple in Kumbakonam is dedicated to Lord Shiva, and it is in this temple that the annual festival of Mahamaham is held. The temple is believed to be at least 1300 years old. The temple has been in existence since the 7th century when the Cholas were reigning over the town. The temple is mentioned in the hymns written by Saivanayanars who were 7th century poet saints of Tamil Nadu.
The temple was greatly worked upon and expanded by the Nayaks between the 15th and 17th centuries. Today, the temple is the largest Shiva temple in the town, boasting of a tall rajagopuram or gateway tower that is 9 storeys high and stands at a height of 125 ft. Within the premises of the temple are three large concentric compounds.
Lord Shiva is worshipped in the form of Adi Kumbeswarar, and the idol of the God is located right in the center of the temple in a shrine.