Why summer in Greece is a possibility that is ordered by rising amount of people? What do we need to visit if we would like to get to know this country?

Why summer in Greece is a possibility that is ordered by rising amount of people? What do we need to visit if we would like to get to know this country?
Greece, according to diverse polls as well as analyses, belongs to those European countries that are not likely to worry about the development in the field of tourism. It is implied by the tendency that, as plenty specialists in the area of tourism say, concerning Greece annually rising percentage of people tend to travel to this country.