The La Brea Tar Pits located in urban Los Angeles are one of the most unique museums in America. Join host Leslie Mueller as she explores this urban ice-age excavation site and the museum that boasts a collection of millions of fossils found in the tar pits including those of mammoths, mastodons, giant sloths, saber-toothed cats and many more. Learn about the work of fossil labs scientists and get a Behind-the-Scenes look at a very special on-going excavation area called "Project 23".