1918: Russia’s Czar Nicholas II, his empress and their five children were executed by the Bolsheviks.
1935: The first parking meters were installed - in Oklahoma City.
1945: The United States exploded its first experimental atomic bomb in the desert near Alamogordo, N.M.
1969: Apollo 11 blasted off from Cape Kennedy on the first manned mission to the surface of the moon.
1973: During the Senate Watergate hearings, former White House aide Alexander P. Butterfield publicly revealed the existence of President Nixon’s secret taping system.