In this March 28, 2014 photo, visitors look Caryatids as the operation, inside a white fabric box, is relayed on a monitor at the Acropolis museum in Athens. It takes about seven months to clean each of the larger than life-sized statues, which were carved around 420 B.C. Work began in 2011, and is expected to be finished in June. (AP Photo/Thanassis Stavrakis)