International tourists have almost quadrupled over the past 30 years and they are now spread all over the world. Surprisingly, Tourism became one of the world’s fastest-growing industries. For this reason, this sector could not remain indifferent to the sustainability challenge of our times. And when it comes to “Sustainable Tourism”, there are three important pillars of the equation: environmental, economic and socio-cultural. All of these in order to fulfill the tourists’ needs without affecting the destinations negatively.