What is the oldest structure in Greece?

Theopetra's Cave, Meteora, Greece The world's oldest man-made structure? According to some estimates, it's a stone wall that blocks the entrance to Theopetra's Cave, not far from the lofty monasteries of Meteora (pictured). Scientists believe it could be 23,000 years old and may have been built to keep out the wind.



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It's staggering to think that 2,000 years ago the Romans were constructing buildings like the Pantheon, a domed masterpiece with a portico of 12 granite columns. It is the oldest building on Earth still in regular use and looking up at its glorious ceiling and occulus, the sense of space is truly breathtaking.

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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. Metz, France -- The Metz Cathedral or Cathedral of Saint Stephen celebrates its 800th anniversary this year.

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For comparison, construction on Stonehenge is believed to started around 3100 B.C.E., while the famed Pyramids of Giza are thought to have been erected around 2600 B.C.E. at the earliest. That makes the roundel at least 1,000 years older than Stonehenge and several thousand years older than the pyramids.

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According to the Ancient Egypt Research Association (AERA), the architectural and geological evidence both support the conclusion that the Sphinx and its adjoining temple were built along with the rest of Khafre's pyramid complex, and were in fact among the last of the monuments to be completed.

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