The “Welcome to Las Vegas” sign is now officially etched into history. Clark County officials announced today that the famous Las Vegas landmark has been accepted into the National Register of Historic Places. The sign, which has welcomed visitors since 1959, was inducted into the register on May 1 after months of research and paperwork by Clark County officials. A plaque was placed at the sign today, marking its place in the registry. “The sign is one of the few landmarks on the Strip that has lasted 50 years,” Clark County Commission Chairman Rory Reid said.