The Nellaiappar Temple is the heart of old Tirunelveli — a sprawling Dravidian complex sacred to Shiva (as Nellaiappar) and his consort Parvati (as Kanthimathi). The two principal shrines stand in adjoining enclosures connected by the Chain Mandapam, and the whole complex extends over more than 600 metres east–west, with seven gopurams of varying scale.
The most celebrated feature is the musical pillars in the Mani Mandapam — slender clusters of stone columns, each carved from a single block, that ring with different musical notes when struck. The 1,000-pillared mandapam, the temple tank, and a remarkable carved chariot in the inner courtyard are other highlights. Non-Hindus may enter the outer courts but not the central shrines.