The idea for the construction of the Olympic Stadium began in 1927 though construction itself would take place between 1934 and 1938. This was done in preparation for the 1940 Summer Olympics that were moved from Tokyo after the breakout of World War II. Construction for the Swimming Stadium began in 1939, but was interrupted due to World War II. The building was resumed in 1947 and completed the following year. A concrete velodrome was built in 1940 though it was not completed until 1946 due to the war. Messuhalli was completed in 1935.