Spanning 25 miles in diameter, this crater is three times the size of the Grand Canyon, making it the largest known impact site in the U.S. and the 15th largest on Earth.

Each year, millions of travelers are drawn to Grand Canyon National Park. Even though it’s widely photographed, nothing compares to seeing this natural wonder of the world in person. Its sheer ...

The 50,000-year-old Meteor Crater is one of Arizona's best roadside attractions. ... But Grand Canyon isn’t the state’s only hole in the ground that attracts hundreds of thousands of visitors ...

Shackleton crater spans roughly 12.4 miles wide (20 km) and 2.6 miles deep (1.3 km), making it deeper than the Grand Canyon, according to the Center for Lunar Science and Exploration. Sign up for ...