Nageswaran Temple, , Tamil Nadu India

Nageswaran Temple, is dedicated to Shiva in the guise of Nagaraja, the serpent king. Also known as "Koothandavar Kovil", it is located near the Kumbakonam old bus stand. Aditya Chola constructed this temple during the 12th century. It stands as a great marvel of Chola architecture, building technology and astronomy. The design and orientation are structured in such a way that it allows sunlight inside the temple only during the Tamil month of Chithirai (April/May), therefore, it bears another name called Surya Kottam or Keel Kottam. The Karuvarai (Sanctum Sanctorum) of Nageswaran temple is similar to that of Sarangapani Temple, as it is made in the form of a Chariot. The temple consists of three gopurams in the eastern western and southern directions.

This vast temple known is for its shrine to Rahu, one of the nine celestial bodies in the Navagraha. A legend has it that the mythological serpents Adiseshan, Dakshan and Kaarkotakan worshipped Shiva here. Legend also has it that King Nala worshipped Shiva here as in Thirunallar. Nageswaran Temple is also known as Koothandavar Kovil which was built by Adithya Cholan of Chola dynasty during 12th century. It is made according to the Chola's architecture and astronomy.