There are numerous waterfalls in the Yellowstone National Park (Wyoming, USA) and even with three days visit, we did not make it to seeing all of them. The Yellowstone National Park is huge (almost 9,000 km²), and three days are not enough to visit all point of interests of the park.
One thing that I remember about my road trip in Scotland was its beautiful scenery along the road. We shared the road with sheep (btw, those white dots on the right picture were actually sheep). The region was so pretty that I wish I could stop in every corner to take pictures.