On this date in 1990,the Supreme Soviet gave approval to switch to a free market economy, the signal for the GDR to leave the now moribund Warsaw Pact.
In 2015 the theme is "Partnerships for Peace - Dignity for All."
Mexico celebrates its independence on this date in 1810.
Mack was murdered by a military death squad due to her criticism of the Guatemalan government's treatment of the indigenous Maya.
Change and catastrophe produced one of the world's most beautiful dances: The Dance of the Feather.
President Jacob Zuma called on South Africans to remember the 44 people killed at the Marikana platinum mine.
Cuban poet, writer, and national hero, José Martí, is buried in Santiago, which was also the home of the revolutionary hero Frank País.
You may not have known that the Riot Act was passed by an act of the British Parliament on this date exactly 300 years ago, July 20, 1715.
The manifesto urged nations to find peaceful ways to settle differences and to renounce the use of nuclear weapons, which only promised "universal death."
In 1415, Czech religious reformer Jan Hus, condemned as a heretic against the doctrines of the Catholic Church, was burned at the stake.