Yellowstone National Park is the first National Park in the U.S. and located primarily in the U.S. state of Wyoming, although it also extends into Montana and Idaho. It is known for its wildlife and its many geothermal features, especially Old Faithful Geyser, one of the most popular features in the park.

The top attractions:

1.  Old Faithful Geyser

2. Mammoth Hot Springs Terraces

3.  Grand Canyon of the Yellowstone

4. Wildlife Viewing