Perhaps you've long dreamed of visiting history-rich Greece and finally put together an itinerary that includes one (or more) of its countless islands, as well as visits to the mountainous mainland and stops in its vibrant cities. Now it's time to ensure your arrival goes smoothly. For many tourists, a valid passport is sufficient to enter Greece, but others need to obtain a visa several months in advance. Here's our guide to the requirements for traveling to Greece, how new