Environment and culture come together this weekend, with free entry to over 100 archaeological sites and museums around Greece today, tomorrow and Sunday. All this and more is part of a new national campaign, unveiled by Culture Minister Michalis Liapis earlier this week. «For us, the environment and sustainable development are intrinsically linked to culture, our daily lives and our quality of life,» noted Liapis recently, adding that this marks the first time the state is undertaking such an initiative. «We are establishing a new institution, because we want to bring young people closer to culture and the environment.» «The Tree of Life in Four Seasons» is the title of the three-day celebration. While visiting, the public will get a chance to get acquainted with cultural sites and participate in a number of activities, including guided tours and other educational projects. Participating museums and institutions in Athens include the National Archaeological Museum, the Byzantine and Christian Museum, the Jewish Museum, Zappeion Hall and the National Gardens, the Foundation of the Hellenic World, the Numismatic Museum and the Benaki Museum. Beyond Athens, the open-doors project includes many regional archaeological museums and sites as well as a variety of cultural venues, such as the Peloponnesian Folklore Foundation in Nafplion and the Averof Gallery in Ioannina.