Greek customs authorities have strict regulations concerning the export from Greece of antiquities, including rocks from archaeological sites. Penalties range from large fines to prison terms. You should ensure that you get a receipt for any item that you buy.
In addition to being subject to all Greek laws affecting U.S. citizens, dual nationals may also be subject to other laws that impose special obligations on Greek citizens. Greek males between the ages of 20 and 45 are required to perform military service; this applies to any individual whom the Greek authorities consider to be Greek citizen, regardless of whether the individual considers himself Greek, has a foreign citizenship and passport, or was born or lives outside of Greece. If remaining in Greece for more than the 90-day period permitted for tourism or business, men of Greek descent may be prevented from leaving Greece until they complete their military obligations. Generally, obligatory, non-voluntary military service in Greece will not affect U.S. citizenship. Specific questions on this subject should be addressed to the citizenship section of the U.S. Embassy in Athens. For additional information, see our information on Citizenship and Nationality. For additional information regarding military service requirements, contact the nearest Greek embassy or consulate as listed above.
If you plan to use public transportation, be sure to buy the appropriate ticket and to validate it correctly, mindful that service to the airport is more expensive than other bus and Metro services, and that ticket inspectors circulate among passengers on trains and buses, and in stations, assuring compliance with ticketing regulations. Currently, the fine for passengers without tickets or with the wrong ticket is 60 times the basic fare, or 84 Euros. If the fine is paid on the spot or within 10 days of the issuance of the ticket, the amount paid is reduced to 50%. The Government of Greece does not permit the photographing of military installations; violators are subject to arrest.
Disaster Preparedness: Greece often experiences forest fires during the dry summer months. Travelers should be particularly mindful of the risk of fires, taking care not to spark one inadvertently through carelessness. The Government of Greece has also produced an earthquake-safety pamphlet for tourists and visitors. Greece experiences frequent seismic activity; tremors are common and serious earthquakes have occurred.