Smilodon fossil in the Page Museum at the La Brea Tar Pits; photo by Dallas Krentzel on Flickr (use permitted with attribution).
Rancho La Brea
Rancho La Brea was designated a National Natural Landmark in 1964. It is the site of the world-famous La Brea tar pits - recognized for having the largest and most diverse assemblage of extinct Ice Age plants and animals in the world.