In a cave in South Sulawesi's Maros-Pangkep, an artwork depicting human-like figures interacting with a pig was dated by researchers from Australia's Griffith University to be at least 51,200 years old. MAROS-PANGKEP, Indonesia, Oct 23 (Reuters) - The world's oldest cave paintings on the Indonesian island of Sulawesi are under threat as heat and smoke from the country's worst wildfires in.