Greece's capital is Athens. Its official language is Greek and its currency is the euro. Citizens of EU countries do not need a visa to visit Greece if their stay is less than 90 days, and they must have sufficient financial resources and return tickets. A valid passport is required for at least 6 months except for citizens of EU, Monaco, and Switzerland. Greece has a Mediterranean climate and a services-based economy. Popular cities include Athens, Thessaloniki, Heraklion, and Patras. Greek cuisine features ingredients like tomatoes, eggplant, olive oil, and lamb and popular dishes include gyros, dolmades, horiatiki salata, and fasolada.