Zion National Park. Attempt one (or both) of the park’s iconic hikes: Angles Landing and The Narrows. Take in expansive views of the night sky from several viewpoints throughout the park.

Great Smoky Mountains National Park held onto its top spot, welcoming 12.19 million visitors, with Zion, Grand Canyon, Yellowstone, and Rocky Mountain national parks rounding out the Top 5. Zion ...