In the 25 years that photographer Peter Essick has shot for National Geographic, he's visited all seven continents, 100 countries, and each of the 50 states. He's photographed more than 30 stories on history, cultural groups, science, and environmental issues, but the subject he likes best is the wilderness landscape. He says, "I believe these landscapes are special treasures that offer almost unlimited creative potential for the artist. It is my hope that these posters will be affirmations of the beauty, inspiring power, and human need for natural lands."