Gunung Padang, a megalithic site in western Java, was built around 2,000 years ago and features terraces, stone structures, and a mysterious stone that makes a loud sound when hit. Local Muslims and Hindus visit for rituals, while followers of the martial art pencak silat practice on the mountain. The site’s construction date has been the subject of much debate, with recent geologists suggesting it could be over 20,000 years old, though archaeological skepticism remains. Similar megalithic structures across Indonesia indicate a tradition of honoring ancestors. Rituals surrounding megalithic monuments continue to this day on islands like Sumatra and Sumba.
https://archaeology.org/issues/july-august-2024/features/javas-megalithic-mountain/