At the Indianapolis Motor Speedway, the first Indianapolis 500 ends with Ray Harroun in his Marmon Wasp becoming the first winner of the 500-mile auto race. Date: May 30, 1911 Read more on Wikipedia → 📅 Other events on May 30 📅 Events on this day in 1911 📅 On This Day (Today)

The Treaty of London is signed, ending the First Balkan War; Albania becomes an independent nation. Date: May 30, 1913 Read more on Wikipedia → 📅 Other events on May 30 📅 Events on this day in 1913 📅 On This Day (Today)

The new, and then the largest, Cunard ocean liner RMS Aquitania, 45,647 tons, sets sails on her maiden voyage from Liverpool, England, to New York City. Date: May 30, 1914 Read more on Wikipedia → 📅 Other events on May 30 📅 Events on this day in 1914 📅 On This Day (Today)

The Lincoln Memorial is dedicated in Washington, D.C. Date: May 30, 1922 Read more on Wikipedia → 📅 Other events on May 30 📅 Events on this day in 1922 📅 On This Day (Today)

May Thirtieth Movement: Shanghai Municipal Police Force shoot and kill 13 protesting workers. Date: May 30, 1925 Read more on Wikipedia → 📅 Other events on May 30 📅 Events on this day in 1925 📅 On This Day (Today)

Memorial Day massacre: Chicago police shoot and kill ten labor demonstrators. Date: May 30, 1937 Read more on Wikipedia → 📅 Other events on May 30 📅 Events on this day in 1937 📅 On This Day (Today)

World War II: Manolis Glezos and Apostolos Santas climb the Athenian Acropolis and tear down the German flag. Date: May 30, 1941 Read more on Wikipedia → 📅 Other events on May 30 📅 Events on this day in 1941 📅 On This Day (Today)

World War II: One thousand British bombers launch a 90-minute attack on Cologne, Germany. Date: May 30, 1942 Read more on Wikipedia → 📅 Other events on May 30 📅 Events on this day in 1942 📅 On This Day (Today)

The Holocaust: Josef Mengele becomes chief medical officer of the Zigeunerfamilienlager (Romani family camp) at Auschwitz concentration camp. Date: May 30, 1943 Read more on Wikipedia → 📅 Other events on May 30 📅 Events on this day in 1943 📅 On This Day (Today)

A dike along the flooding Columbia River breaks, obliterating Vanport, Oregon within minutes. Fifteen people die and tens of thousands are left homeless. Date: May 30, 1948 Read more on Wikipedia → 📅 Other events on May 30 📅 Events on this day in 1948 📅 On This Day (Today)