With 22 national parks and monuments to its name, Arizona boasts some of the most astonishing landscapes in the country, from the Grand Canyon to the towering buttes of Monument ...

Free. Grand Canyon Caverns are a dry cave system near Peach Springs in northwestern Arizona. The lack of moisture helps preserve the formations and keeps the air inside the cave clear and clean.

From spectacular landscapes — hello, Havasu Falls — to artistic wonders, here are 10 of the most beautiful things to see in ...

Two Grand Canyon-size features on the far side of the moon were likely formed in about 10 minutes after an unknown object ...

These hidden gems in Arizona are picture perfect in every way. Come explore historic sites, mesmerizing lakes, and even a ...

The vast valleys of Vallis Schrödinger and Vallis Planck demonstrate the incredible forces that shaped the face of the Moon.

After a two-year dry spell, Grand Canyon Caverns, one of the largest dry caverns in America, will be having a grand ...

The Earth's Grand Canyon took millions of years to carve, but the moon's grand canyons took about ten minutes.

There are alot of great caves in the US but there is a hot debate over which one is better Mammoth Cave or Carlsbad Caverns.

Everyone knows Arizona is nicknamed the Grand Canyon State. But did you know it's also been called the Baby State or the Sweetheart State at various points in history? Arizona didn't have an ...