Passport and Visas
For travel within the E.U., E.U. citizens can use their passport or their police I.D. card.
However, apassport is necessary for a number of other transactions, such as currency exchange,purchases, etc.
Participants should check with their travel agents, Greek consulate offices or diplomatic missions in their own countries, whether or not visas are required or visit the web site of the Greek Ministry of Foreign Affairs
Note: During their stay in Greece, visitors with a visa must also have suitable insurance coverage for emergency medical or other needs.