The National Geographic Image Collection is an amazing site full of more than 11 million images that chronicle the world from the end of the 19th century to the beginning of the 21st century.
The collection includes images related to exploration, wild life, people and cultures, and science and climate change. The images would be a great way to help you tell the story of our world as you teach students about history, science, wild life, and culture. These images will help to connect students with learning in ways that a textbook simply can not. The National Geographic Image Collection would also be a fabulous place to have students pick a picture to use for a writing prompt.