The original National Park, Yellowstone is also one of the largest and most popular in the U.S. Parks system. If you are hoping to see the many wonders within this park, you'll need to rent a car.

The park's major offerings are spread out and available via the 204-mile Grand Loop road. Yellowstone's top three must-see attractions are: Old Faithful, Grand Prismatic Spring, and Mammoth Hot Springs.

For a cheaper alternative to staying in the park, West Yellowstone, Montana is a charming town west of the park with plenty of restaurants, souvenir shops, and a Wolf Discovery Center. Finally, if you're visiting Yellowstone on a larger road trip, don't forget to visit Grand Tetons National Park, which is only an hour south.