Wikipedia:Selected anniversaries/May 27
May 27: Pentecost in Christianity (2007); Children's Day in Nigeria
- 1153 - Malcolm IV became King of Scotland at the age of twelve.
- 1860 - Expedition of the Thousand: Giuseppe Garibaldi and his Redshirts launched their attack on Palermo, capital of the Two Sicilies.
- 1919 - The flying boat NC-4 arrived in Lisbon, Portugal, becoming the first fixed-wing aircraft to complete a transatlantic flight under its own power.
- 1937 - The Golden Gate Bridge (pictured), a suspension bridge spanning the Golden Gate in California, was opened.
- 1942 - Operation Anthropoid: Czech resistance fighters in Nazi-occupied Prague ambushed and mortally wounded Reinhard Heydrich, the chief of Reich Security Main Office and the Protector of Bohemia and Moravia.