The Arunachaleswarar Temple is a prominent Hindu temple located in Tiruvannamalai, Tamil Nadu, India. Dedicated to Lord Shiva, it is one of the largest temples in South India and is known for its stunning architecture and intricate carvings. The temple complex features a massive gopuram (tower) and is a significant pilgrimage site for devotees. The temple is particularly famous for the annual festival of Karthigai Deepam, where a giant beacon is lit atop the Arunachala Hill, symbolizing the divine light of Shiva. The temple's history dates back to ancient times, with various renovations and expansions carried out over the centuries.