Aadi Ratneswarar Temple, located at Tiruvaadaanai is a vast temple dedicated to Lord Shiva. This temple of Sivaganga District has a nine-tiered 130 ft high Rajagopuram and is spread over an area of 10 acres. The principal deity of this temple is called Aadaanainathar and there are separate shrines for Goddess Anbayiammai, Surya and Chandikeswarar. The temple houses several sculptures and mandapams, which include the Chokkatanchari mandapam with 291 carved pillars, well-spaced prakarams and imposing walls. The main temple festival in this district is the annual Brahmotsavam celebrated in the month of Vaikasi (May-June). Arudra Darisanam and Kartikai Deepam are the other festivals conducted here.
Arulmigu Valarolinathar Temple and Arulmigu Valarolinathar Temple are the two famous temples of Sivaganga District. The former temple is the third biggest temple among the Nagarathar clan temples and is known for its Nagara Viduthi, a structure rich with sculpture and woodwork. The presiding deities are Valarolinathar and his consort Vadivudaiammai. Kaalaiyeesar Temple, dedicated to Lord Shiva has a 150 ft high Rajagopuram and an imposing Teppakkulam tank. Legend says that the elephant of Lord Indra, Airavatam, created the tank. The temple has three shrines, which are associated with three functions of creation, preservation and completion. The main festivals of this temple are the Kaaleesar's festival in the month of Thai (January-February) and Someswarar's Brahmotsavam celebrated in Vaikasi (May-June).
Kaliyar Koil is a highly revered shrine of Sivagangai District and the presiding deity here is Lord Shiva, known as 'Kaleesar'. The temple boasts a huge Rajagopuram. The major teerths of the temple are Shivaganga, Kali Teerth, Vishnu Teerth, Lakshmi Teerth, Digpalaka Teerth, Sudarsana Teerth and Rudra Teerth. It is believed that Sage Agastya came to this place and took bath in the holy Teerth of Shivaganga, where he visualized the real form of Lord Shiva. Indra Vizha Festival, celebrated in this temple, is attended by large number of people from far and near.
The Temples of Sivaganga District have numerous classic wall paintings and they usually include ten avatars of Lord Vishnu, the five Pandavas, Draupadi, and the chief deities. Vairava Theertham, a sacred spring near one of the temples of Sivaganga District, is said to have miraculous powers. Pillaiyarpatti temple, Koviloor Temple, Kandadevi Temple, Nagarasivan Temple, Kaleeswarar Temple, Thirukostiyur Temple and Kovilur Temple are some of the important temples of Sivaganga District.