Yellowstone
The world's first national park: geysers like Old Faithful, the Grand Prismatic Spring, bison, and the Grand Canyon of the Yellowstone.
Tip: Most roads are closed from November to April; distances inside the park are long.
One of the 11 national parks where visitors from abroad pay $100 a person on top of the entrance fee, since 1 January 2026. With two or more of them on your trip, the $250 annual pass is cheaper: travel info.