Rome was the choice of the IOC, but the 1906 eruption of Mount Vesuvius forced the Italians to return the Games to the IOC, which reattributed them to London.（“1908 Olympics: London, England”. Hickok Sports. 2007年4月9日閲覧。）
Due to the outbreak of the Second Sino-Japanese War, Japan relinquished its hosting rights to both the Summer and Winter Games. On 1938-07-15, the IOC relocated the Summer Games to Helsinki and the Winter Games to St. Moritz. Finland's invasion by the Soviet Union, in 1939, and the ensuing World War II forced the IOC to cancel the 1940 Summer Games.（“1948 Olympics: London, England”. Hickok Sports. 2007年4月10日閲覧。） Disagreements with the Swiss officials, concerning the entry of professional skiers in the Games, prompted the IOC to reattribute them for the second consecutive time to Garmisch-Partenkirchen, on 1939-06-09. They were cancelled as well because of the war.（“St. Moritz 1948”. Games. International Olympic Committee. 2007年4月9日閲覧。）
Antwerp was awarded with the Olympic Games as a compensation and to honour the Belgians who fought, suffered and died during the war.（“Antwerp 1920”. Games. International Olympic Committee. 2007年4月9日閲覧。）
Due to the outbreak of the Second Sino-Japanese War, Japan relinquished its hosting rights to both the Summer and Winter Games. On 1938-07-15, the IOC relocated the Summer Games to Helsinki and the Winter Games to St. Moritz. Finland's invasion by the Soviet Union, in 1939, and the ensuing World War II forced the IOC to cancel the 1940 Summer Games.（“1948 Olympics: London, England”. Hickok Sports. 2007年4月10日閲覧。） Disagreements with the Swiss officials, concerning the entry of professional skiers in the Games, prompted the IOC to reattribute them for the second consecutive time to Garmisch-Partenkirchen, on 1939-06-09. They were cancelled as well because of the war.（“St. Moritz 1948”. Games. International Olympic Committee. 2007年4月9日閲覧。）
Chamonix was chosen by the IOC to stage the "International Sports Week 1924", which would later be considered the First Olympic Winter Games.（“Chamonix 1924”. Games. International Olympic Committee. 2007年4月8日閲覧。）
Denver gave up its hosting rights because a state referendum prohibited allocation of public funds to support the Games. The Austrian city of Innsbruck, which had hosted the Games twelve years earlier, stepped in to replace Denver.（“Innsbruck 1976”. Games. International Olympic Committee. 2007年4月9日閲覧。）
