1788 Founding of Sydney Colony, AustraliaCaptain Arthur Phillip hoisted the Union Flag, establishing the British settlement at Sydney Cove, now commemorated as Australia Day. 1905 Discovery of the Cullinan DiamondThe world’s largest diamond, weighing 3,106 carats, was discovered in South Africa. 1915 Rocky Mountain National Park EstablishedThe U.S. Congress officially designated this iconic region in … Continue reading This Day In History