Agate Fossil Beds National Monument in Nebraska is a glimpse into life on the High Plains 20 million years ago. Paleontologists believe that a drought may have brought numerous herd animals together near dwindling water sources, where they perished near each other, leaving behind a rich trove of fossils. Informative exhibits in the visitor center show what remains of these creatures from the Miocene epoch. Walk trails, view fossils and animal skeletons, and see Native American artifacts.
Former residents of Agate Fossil Beds include the Dinohyus, or "terrible pig," the Daphoenodon, or "bear-dog," and the Moropus, an 8-foot horse-like creature.