The Arulmigi Alagirinathar Temple located at the heart of the city is also known by the names of Thirukoil Kottai Perumal and Kottai Perumal Koil. Constructed several centuries ago, this ancient temple is well known for its sculptures. The temple is flanked by two other temples dedicated to Azhagiri Perumal and Mariamman. There are several important festivals celebrated in this temple. The most important of them is the Vaikunta Ekadasi. During this time, thousands of devotees throng to the place to worship the Goddess.
Other important celebrated in this temple include the Brahmotsavam, Navrathri, Pavithrotsavam, Puratasi and Aandaal Thirukalayanam. The Aandaal Thirukalayanam is a celebration in which the deity is honoured by a special garland from Sir Villi Puttur. Devotees from the places close to the city come to this temple to offer their prayers during these celebrations.