April 18: Holy and Great Saturday (Eastern Christianity, 2009); Festival of Matsu (Southeast Asia, 2009); Independence Day in Zimbabwe Saint Peter's Basilica by Giovanni Paolo Pannini * 1025 – Bolesław I Chrobry became the first King of Poland. * 1506 – Construction of the current St. Peter's Basilica (interior pictured) in Vatican City, to replace the old St. Peter's Basilica built in the 4th century, began. * 1906 – A major earthquake and resulting fires devastated San Francisco, killing at least 3,000 people and leaving more than half of the city's population homeless. * 1942 – World War II: Sixteen B-25 Mitchell bombers from the aircraft carrier USS Hornet carried out the Doolittle Raid, the first Allied attack on the Japanese home islands. * 1983 – A suicide bomber d