A man jogs on a treadmill inside the Milan Gale Muskatirovic Sports Centre in Belgrade, Serbia, July 22, 2019. After World War Two socialist Yugoslavia led by Josip Broz Tito set out to reconstruct a land destroyed by fighting. Residential blocks, hotels, civic centres and monuments all made of concrete shot up across the country. REUTERS/Marko Djurica SEARCH "ARCHITECTURE DJURICA" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.