What is the most famous natural landmark in the United States?

The most famous natural landmark in the United States is the Grand Canyon, located in Arizona. The Grand Canyon is a colossal canyon carved by the Colorado River over millions of years. It stretches for 277 miles (446 kilometers) and reaches depths of over a mile (1.6 kilometers). The canyon is famous for its stunning geological formations, vibrant colors, and panoramic views. It is one of the most visited national parks in the United States and attracts millions of tourists each year.