The Kumari Amman Temple, dedicated to the goddess Kumari Devi (the virgin goddess), occupies the very tip of the Indian peninsula where the Bay of Bengal, the Arabian Sea, and the Indian Ocean converge. It is one of the 108 shakti peethas — sacred sites dedicated to manifestations of the goddess — and draws pilgrims from across India alongside the tourists who come for the geography.
The temple's origins are ancient, though the current structure is relatively modern. The setting is the main thing: the forecourt looks directly out over the confluence of three seas, with the offshore islets and their memorials visible in the water. Pilgrims who have bathed in the sea before entering bring wet sand and flowers. The atmosphere is genuinely devotional despite the crowds, and the evening aarti (lamp ceremony) is worth seeing if you are in town.