This temple is located about 1 Km distance from the Bus-stand. The famous name of the temple is RajaRajesuram and the earlier history says that the "Naimicharanya" hermits lived in the place where the temple was erected. The speciality of this temple is that it has been sculptured completely with stones without having the Mountain around its surroundings. The tower of this temple is previously called as " Dhakshina Meru". This temple is facing along East direction and it has three main entrances namely "Keralandagam", "RajaRajan"and "Anukkan". When we go through these three vayils , we can reach the inside of the vayils', it measures 500 m in length and 250 m in breadth. In these Vayils', " Murugan Temple, Anjaneyar Temple, Varahi Temple, Vinayagar Temple, Natarajar Temple and Karuvurar Temple " can be seen.Inside the Karuvurar Temple, a massive Linga is installed in a place called Avudaiyar. The Linga measures 9 ft in height, 23.5 ft in circumferrence.The Linga brought from the shore of Narmadha river. This Linga is also called as "Raja Rajeswara Mudaiyan ", because of its bright appearance.The total area of the temple measures 237.9m in length and 119.1m in breadth.The height of centre Vimana is 64.8m. The top of the Tetrangled Vimana has been closed with a round stone measuring 81.3 tons weight, and fashioned from a single piece of black stone. To get the stone to the top of the vimana, a slope path made for 6Kms from the northern side of the Thanjavur. The gateway to the inner court yard is guarded by an elephant and one of the largest Nandhis in India measuring 6m long by 3m high, and fashioned from a single piece of rock The Massive Nandhi measures 25 tons weight. This is the second biggest Nandhi in India. In all, there are 250 lingams in the inner shrines along the outer walls. The frescoes adorning the walls and ceilings of the inner court yard have been dated to Chola times and were executed using techniques similar to those used in European frescoes work.