Answer:
Göbekli Tepe
Step-by-step explanation:
The Pantheon is the oldest building in the world that's still in use today. Since the 7th century, it has been a Roman Catholic church. Built around 125 A.D. by the Roman emperor Publius Aelius Hadrianus, it was actually the third iteration of the structure.
Göbekli Tepe. Göbekli Tepe is an archaeological site of a temple in Southeastern Turkey and has been dated back to 9500 - 8000 BCE. This date was discovered by carbon dating old tools found during excavations. This building is in fact the oldest structure on earth that we have found to date.
The oldest archaeological evidence of house construction comes from the famous Oldupai Gorge (also called Olduvai Gorge) site in Tanzania, and the structure is around 1.8 million years old. Nobody knows exactly which proto-human species is responsible for the tools (and houses) found at Oldupai.