The Jagannath Temple in Puri, Odisha, is one of the most revered and ancient Hindu temples in India, forming one of the four principal Char Dham pilgrimage sites. Its origins are shrouded in Puranic legends and possibly linked to the assimilation of an indigenous tribal deity (Nila Madhava) into the Vaishnava fold. While the site's sanctity is ancient, the construction of the present colossal temple complex was initiated by King Anantavarman Chodaganga Deva of the Eastern Ganga Dynasty, likely starting in the late 11th or early 12th century CE. It was largely completed and consecrated under his descendant, King Ananga Bhima Deva III, in the 13th century. Architecturally, it is a magnificent example of Kalinga style, featuring a towering Rekha Deul (curvilinear main tower, approx. 65m high) housing the main deities, and an attached Pidha Deul (pyramidal hall for audience). The vast complex includes numerous subsidiary shrines, mandapams, and the world's largest temple kitchen (Rosaghara). Unique to this temple are the principal deities: Lord Jagannath, his brother Balabhadra, sister Subhadra, and the Sudarshana Chakra, all carved from sacred Neem wood. These idols are replaced in a complex, secret ritual called Nabakalebara ('New Body') approximately every 12-19 years. The temple withstood numerous invasions and desecration attempts throughout history, particularly during the medieval period by forces like the Bengal Sultanate (e.g., Kalapahad in the 16th C), necessitating the idols to be hidden multiple times. It served as the spiritual heart of the Ganga and later Gajapati empires of Odisha. It has been a major center for various Vaishnava traditions and saints, including Ramanujacharya and especially Chaitanya Mahaprabhu in the 16th century. The annual Ratha Yatra (Chariot Festival), where the deities are paraded in enormous chariots, attracts millions globally, showcasing the temple's enduring historical and cultural significance.