The La Brea Tar Pits are pits of, well, tar that has been bubbling up from beneath the earth for tens of thousands of years. They’re viewable for free, and the compact La Brea Tar Pits Museum (which does charge admission) exhibits fossils and bones that were preserved when animals became trapped in said tar. It’s a major landmark, and one of the most visited tourist spots in all of Los Angeles. The collection of bones is extraordinary. There are spectacular composite skeletons of many extinct species, including Columbian mammoths, ground sloths, dire wolves, North American camels, and, of course, the famous saber-toothed cat. Beyond the skeletons, there are over a million Ice Age fossils to peruse.