While excavating in a lightly explored eastern region of their home country, a team of Iranian archaeologists unearthed the remains of a solid circular adobe structure that featured six separate towers. The ancient structure, which was constructed on a man-made mound known as Tappe Takhchar-Abad, has been dated to the sixth century BC, during the era of the legendary Achaemenid Empire. This means the building and its towers are at least 2,500 years old. The astonishing fortress was discovered near the city of Birjand in the province of South Khorasan in northeast Iran. It is an architectural relic from ancient times when Iran was a center of remarkable civilizations, showcasing the ingenuity of Achaemenid builders and their mastery of adobe
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