A gopuram or gopura is a monumental tower, usually ornate, at the entrance of any temple, especially in Southern India. They are a prominent feature of koils, Hindu temples built in the Dravidian style. They are topped by the kalasam, a bulbous stone finial. They function as gateways through the walls that surround the temple complex. A koil may have multiple gopurams, typically constructed into multiple walls in tiers around the main shrine.