Some of the city's most prominent architectural features and best known historical events date from the turn of the 20th century. The Soldiers' and Sailors' Monument, dedicated on May 15, 1902, would later become the city's unofficial symbol. Ray Harroun won the inaugural running of the Indianapolis 500, held May 30, 1911, at Indianapolis Motor Speedway. Indianapolis was one of the hardest hit cities in the Great Flood of 1913, resulting in five known deaths and the displacement of 7,000 families.