Chewing gum, high heels and soft-drink stains: Why Athens’ iconic marble Olympic stadium is getting its first deep clean in more than a century

Chewing gum, high heels and soft-drink stains have become unlikely culprits behind the grime covering Athens’ iconic Panathenaic Stadium. The all-marble landmark, known as the Kallimarmaro, is undergoing its first systematic cleaning in more than a century, with conservation workers carefully removing dirt and organic material without damaging the historic stone.