Here are a few things from a century ago. -
1910 - First photo of Halley's Comet 1910
1910 Boy Scouts of America is founded
1911 First air conditioner invented
1912 Sinking of the Titanic
1912 First use of zippers in clothing
1913 Panama Canal completed
1914 Outbreak of World War I
1915 Fist use of poison gas in warfare
1916 Albert Einstein - General Theory of Relativity
1917 USA enters World War I
1918 Lawrence leads Arabs into Damascus
1919 First airline between London and Paris