Visitors and staff at Zoo Knoxville are mourning the passing of the oldest rhinoceros in the United States. Dolly was a southern white rhino who spent decades living at the Tennessee zoo.

For the first time in four months, early-morning commuters are driving over the southbound lanes of the Daniel Carter Beard Bridge, better known as the Big Mac Bridge.

Today, L.A. Metro’s subway tunnels connect some of the city’s most densely populated neighborhoods. There are many other ...