Electronic ticket machines at the nation's archaeological sites are on their way in. Following the approval of the Central Archaeological Council (KAS), the machines will be installed at 17 archaeological sites and 12 museums across the country. Many other works must be completed before the system can be comprehensively implemented. For instance, booths must be constructed to house the machines and staff must be trained, among other things. So for now, the system will be applied on an experimental basis as of next summer in Lindos, the National Archaeological Museum and at Delphi. The museums and sites selected (based on the number of visitors) are the Acropolis, the Ancient Agora, the Roman Forum, Hadrian's Library, the Kerameikos Cemetery, Ancient Olympia, the National Archaeological and the Byzantine museums in Athens, the ancient cities of Knossos and Phaestos on Crete, as well as the museums of Iraklion and Hania, Mycenae, Epidaurus and Delphi, Thessaloniki's Museum of Byzantine Culture and Archaeological Museum, Lindos and the Great Magician's Palace in Rhodes, the Asclepeion in Kos and Santorini's Akrotiri and the Museum of Prehistoric Thera. KAS leaders said the machines are also intended to keep out those visitors who want to enter without purchasing tickets.