500th Anniversary of the Protestant Reformation in Europe (a Catholic reformation followed in response to the Protestant Reformation. Martin Luther was a key figure of the Protestant Reformation; he nailed his 95 Thesis to the Castle Church door of Wittenberg on October 31, 1517.
http://www.pbs.org/program/martin-luther-idea-changed-world/
http://www.luther.de/en/95thesen.html
http://www.luther.de/en/anschlag.html
100th Anniversary of the Bolshevik Revolution in Russia (Communism)
http://nation.com.pk/08-Nov-2017/100th-anniversary-of-the-bolshevik-revolution-in-russia
https://www.biography.com/news/russian-revolution-100th-anniversary-facts
