Uncategorized 4000 Year Old Arch Posted by swimfast on September 10, 2007September 10, 2007 4000 Year Old Arch, originally uploaded by swimfast. This arch is 4000 years old. *pause to let that sink in*. It’s the oldest known arch in the world today. Recently discovered as part of the ancient city of Ashdod on the Mediterranean coast of Israel. 4000 years. that’s circa 2000 b.c.e. Amazing.