Batu Caves is a limestone hill that features a series of caves and cave temples. It is one of the most popular Hindu shrines outside India, dedicated to Lord Murugan. The most striking landmark is the world's tallest statue of Lord Murugan (42.7 meters), covered in 300 liters of gold paint, which stands at the base of a steep flight of 272 steps. In 2018, the stairs were famously painted in vibrant rainbow colors. The caves themselves are around 400 million years old. The main 'Cathedral Cave' is massive, with a ceiling reaching over 100 meters high, illuminated by natural light through holes in the rock. The site serves as the focal point of the annual Thaipusam festival, where hundreds of thousands of pilgrims climb the stairs to offer sacrifices.