The document discusses several urban planning and redevelopment projects in Athens, Greece aimed at regenerating the city center, making it more sustainable, accessible, and lively. Key projects mentioned include regenerating empty buildings as cultural centers through OKRA's competition-winning plans, improving traffic flow and adding bike lanes and tram extensions, upgrading green spaces, and developing the large former airport of Hellinikon into a metropolitan park, sports facilities, and residential and commercial areas. The Stavros Niarchos Foundation is also funding a new National Library and Opera building as well as park in Athens. "Project Athens" outlines a 10-year development program to improve quality of life and competitiveness through various initiatives. OpenHouse Athens celebrates