Summer Olympic Games demand for tickets to all levels of each event, there was controversy when seats set aside for sponsors and National Delegations went unused in the early days. A system of reallocation was put in place so the empty seats were filled throughout the Games. Rio de Janeiro, Brazil hosted the 2016 Summer Olympics, becoming the third city in the Southern Hemisphere to host the Olympic Games after Melbourne, Australia, in 1956 and Sydney, Australia, in 2000, and the first South American city to host the Olympics. The preparation for these Games was overshadowed by controversies, including the instability of Brazil's
Winter Olympic Games City, previously a candidate for the 1972 Winter Olympics, then put itself forward, but the IOC opted instead to invite Innsbruck to host the 1976 Games, as most of the infrastructure from the 1964 Games had been maintained. Despite only having half the usual time to prepare for the Games, Innsbruck accepted the invitation to replace Denver in February 1973. Two Olympic flames were lit because it was the second time that the Austrian town had hosted the Winter Games. The 1976 Games featured the first combination bobsleigh and luge track, in neighbouring Igls. The Soviet Union won its fourth