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 miscellaneous surveys as well as analyses, belongs to those European countries that cannot worry about the popularity in the area of tourism. It is indicated by the fact that, as a lot of professionals in the area of tourism convince, concerning Greece year by year increasing number of people tend to travel to this country.