Greece is now seeing hundreds of thousands more air passengers in the winter months compared to just a few years ago.
The square has long been one of central Athens' most important hubs, although it had fallen on hard times in recent years.
The actor, famed for his turn as King Leonidas in the blockbuster "300", will carry the Olympic flame near Sparta in March.
More than 300 people contributed to the restoration, which engineers said did not use any modern materials or techniques.
The book, featuring photos by Mary Chatzaki displayed in an exhibition last year, provides an intimate look at the restoration of a major Cycladic temple.
For the first time, a squash tournament will be among the sporting events being held in the run up to the Posidonia shipping exhibition.
The apps being developed across the continent will help cities deal with growing environmental challenges and aid with disaster response efforts.
