What are the 3 most visited "natural attractions" in the U.S.?

I know one of them is the Grand Canyon

Thanks.:D What are the 2 others? Does anyone else know?

http://www.enotes.com/science-fact-finder/earth/which-natural-attractions-united-states-most

To determine the three most visited natural attractions in the U.S., we can look at the National Park Service's visitation statistics, which provide data on the number of annual visitors to national parks and other sites. Here's how you can find this information:

1. Visit the National Park Service website: Go to the official website of the National Park Service at www.nps.gov.

2. Explore the "Plan Your Visit" section: Look for the "Plan Your Visit" tab on the website's homepage. This section provides various resources and information about national parks and natural attractions.

3. Find visitor statistics: In the "Plan Your Visit" section, you will often find a subsection or link dedicated to visitor statistics. Click on this link to access the relevant data.

4. Sort the data: Once you access the visitor statistics, you may be presented with a list of national parks and their corresponding visitor numbers. Sort the data by visitor numbers to identify the most visited natural attractions.

By following these steps, you will be able to find the most accurate and up-to-date information on the three most visited natural attractions in the United States, based on the data provided by the National Park Service.