Question: what is the oldest structure on earth?
Answer: Dating back to 3600 BC and 700 BC, the Megalithic Temples of Malta are considered to be the oldest free-standing structures on earth. The temples were built during three phases of cultural revolution – Ġgantija (3600-3200BC), Saflieni (3300-3000BC) and Tarxien (3150BC-2500BC).