The capital city is Athens. A passport is required but no visa is needed for tourist or business stays of up to three months.
Medical facilities are adequate, and some in Athens and Thessaloniki are quite good.
U.S. medical insurance is not always valid outside the United States. Travelers have found that in some cases, supplemental medical insurance with specific overseas coverage, including provisions for air evacuation, has proved to be useful. The usual safety precautions practiced in any urban area ought to be practiced during a visit to Greece. The loss or theft of a U.S. passport should be reported immediately to the local police and nearest U.S. embassy or consulate. It provides useful information on guarding valuables and protecting personal security while traveling abroad.