Spain legalized same-sex marriage.
This made Spain the fourth country in the world to do so.
Source
The Nazi Party killed around 1,000 people, which became known as the 'Night of Long Knives.'
Charles Blondin became the first person to cross Niagara Falls by walking across a tightrope.
Charles J. Guiteau was hung until dead for the assassination of US President James A. Garfield.
Donald Trump became the first US president to visit North Korea while meeting Kim Jong Un.
Tower Bridge officially opened in London.
