If you are looking for a place to explore the ancient history of life on Earth, you might want to visit Dinosaur National Monument. This national monument, located on the border between Colorado and Utah, is home to over 800 paleontological sites and has fossils of dinosaurs such as Allosaurus, Deinonychus, Abydosaurus, and various sauropods. You can see over 1,500 dinosaur fossils exposed on the cliff face inside the Quarry Exhibit Hall, where paleontologist Earl Douglass discovered the first dinosaur skeleton in 1909. You can also hike along trails that lead you to petroglyphs left by earlier cultures, or raft on the Green or Yampa rivers that flow through deep canyons. Dinosaur National Monument covers over 210,000 acres and offers a wealth of natural and cultural resources for both science and recreation. Whether your passion is dinosaurs, geology, history, or scenery, you will find something to enjoy at this unique park.