The Balathandayuthapani Temple, officially the Arulmigu Balathandayuthapani Kovil, and better known as the Waterfall Hill Temple or Hill Top Murugan Temple among local is consider one of the most oldest temple in Penang. The main deity of this temple is Murugan. Visitor need to climb 511 stair to reach the temple. It is the focal point of Hindu festival of Thaipusam in Malaysia after the Batu Caves The hilltop temple, with its seven-storey 21.6m-tall gopuram (main tower), has been touted as the largest Lord Murugan temple outside India.
According to popular belief, a sadhu (holy man) chose a spot close to the waterfalls for a shrine dedicated to Murugan. The place was called thanner malai, meaning water hill, and the deity itself was known as Thannermalaian, or "he who resides by the waterfall". By the early part of 1800 the shrine seemed to have been the focus of Thaipusam celebration, a festival dedicated to Lord Murugan.
British records and local newspapers do mention of Hindu devotees celebration the festival. In 1850 with the increase of the local population, the British authorities decided to develop the area into a reservoir. They decided that the waterfall area and the immediate catchment area had to be protected. At the same time they did not want to upset the sentiments of the Hindu population. Therefore, they alienated an eleven acre hillside property for the location of a proper temple.
The Balathandayuthapani temple has undergone several major renovations. This is in keeping with the requirements of the Hindu religious tenets, that renovations be done for every mamangam, or 12-year cycle.