Calatrava reorganized the existing 100-hectare area and designed a new roof for the Olympic Stadium; a new roof and refurbishing of the Velodrome; entrance plazas; and entrance canopies for the entire complex. Additionally, and on his own initiative, he designed the Agora complex; a central Plaza of the Nations, including tree-lined boulevards; a pair of arcade structures; his own version of an Olympic cauldron — a giant torch; a sculptural Nations Wall; a new warm-up area for athletes: pedestrian bridges and connections to public transportation; parking areas; bus terminals; and installations for all service elements. (Santiago Calatrava)