Designed by decorated architect Renzo Piano as a cultural and recreational hub, it provides a state-of-the-art HQ for the Greek National Opera and National Library of Greece, set within a landscaped park peppered with playgrounds, as well as a 400-metre seawater canal. This civic-minded landmark hosts an incredible line-up of free events all year—from concerts, theatre, movies and festivals to sporting activities, chess and gardening clubs.