Answer: Indonesia
Notes: Archaeologists have revealed that a massive underground pyramid in Indonesia, known as Gunung Padang, predates Egypt’s Giza Pyramids and England’s Stonehenge, making it one of the oldest megalithic structures ever constructed by humans. Gunung Padang stands as the world’s oldest pyramidal structure, constructed on the site of an extinct volcano long before the emergence of civilizations and the advent of agriculture.
