What UNESCO site is also the most-visited U.S. national park?

Here is the question :

WHAT UNESCO SITE IS ALSO THE MOST-VISITED U.S. NATIONAL PARK?

Here is the option for the question :

• Yellowstone
• Great Smoky Mountains
• Yosemite
• Everglades

The Answer:

And, the answer for the the question is :

Explanation:

[STC0018412]. The Great Smoky Mountains National Park is the most visited national park in the United States, with an annual visitor population of 13 million. Since 1983, the 800-square-mile park in Tennessee and North Carolina has been designated as a UNESCO World Heritage Site. Over 3,500 plant species and a wide range of salamander species can be found in the Smokies.