Arizona is certainly one of the most beautiful states, with a number of national parks. The Grand Canyon is breathtaking. Most people only see the south rim, but the north rim is equally as beautiful and is far less crowded, as it is a bit out of the way.

A view of Petrified Forest National Park. (2015)

While visiting the Petrified Forest National Park, I saw this Eastern Collared Lizard sunning itself on a chunk of petrified wood. (1995)

Aerial shot of Meteor Crater from a NASA jet. (1999)

Panoramic shot from rim of Meteor Crater. (2015)

The Superstition Mountains. (2005)

In November 2002, I was asked by Columbia University to give a talk on meteor showers at Biosphere II, which is just outside of Oracle, Arizona. (2002)

This is a cactus wren sitting on top of a saguaro cactus in Saguaro National Park. (2002)

Sunset Crater Volcano. The volcano is north of Flagstaff and is classed as a cinder cone. It last erupted in the 11th century. (1995)

The Grand Canyon from the south rim. (2015)

Another shot of the Grand Canyon from the south rim. This time late in the day, with the Sun much lower. (2015)

A tree twisted by the wind on the south rim of the Grand Canyon. (2015)

Sunset from the north rim of the Grand Canyon. (2015)