Johnny, Doc and Tommy discuss their 4th of July holiday plans. 07/04/1975 JOHNNY CARSON

The Del McCoury Band performing "All Aboard" at Music City Roots Live From The Factory on 9.22.2016

Watch the music video for "Land of Dreams," the original song written by Rosanne Cash and John Leventhal and performed by Rosanne Cash and guest artists Los Lobos, Bebel Gilberto and TREME. Encouraging travelers to come and find your "Land of Dreams," they are featured in the first ever global tourism campaign for the United States. You can download the song for free here: http://www.discoveramerica.com/

Experts estimate that half of our planet's species will become extinct by the year 2100. National Geographic photographer Joel Sartore is trying to change those stats.

The eruption of Mount Tavurvur volcano on August 29th, 2014. Captured by Phil McNamara.