Many Australians celebrate the Queen's Birthday each year, as Australia is a constitutional monarchy.
Day of German Unity
German Unity Day celebrates Germany's unification in 1990. It is on October 3 each year.
Columbus Day celebrates the arrival of Christopher Columbus on the American continent in 1492.
The Prophet Muhammad's Birthday
Mawlid, or Milad, marks the birth of the Islamic prophet Muhammed, or Mohamed, in the year 570 of the Gregorian calendar.