This is quite incredible: every single day of the Second World War in Europe as mapped out by YouTube user EmporerTigerstar.

Starting with the German invasion of Poland (1 September, 1939), the invasions of Norway (April 9, 1940), France (May 10, 1940), Yugoslavia and Greece (April 6, 1941), to the invasion of the Soviet Union (June 22, 1941), through to the Battle of Moscow (November 25, 1941), the Battle of El Alamein (October 23, 1942), the German surrender at Stalingrad (January 31, 1943), the Allies capture of Rome (June 4, 1944), the Normandy Landings (6 June, 1944), the liberation of Paris (August 25, 1944), the Soviets enter Berlin (April 23, 1945), and Victory Europe Day (8 May, 1945).

EmporerTigerstar has previously mapped the First World War, and is planning to create a map for the Second World War including all the battles.
 

 
Via i09