After 70 years of digging, the ancient city of Sardis in western Turkey has joined UNESCO’s World Heritage list, with ongoing excavations uncovering how successive civilisations left lasting marks on the ancient city

As we prepare our bags to go off for a summer holiday, or meander through the narrow, brightly-lit streets of an ancient European neighbourhood, we are not merely walking on plain road surfaces of asphalt or stone. Instead, we are walking above layers of earlier urban life hidden beneath the surface.

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