Exclusive Edition - The Ultimate Field Guide to Photography: Buy Now!
Visit our Online Shops

Sign up for free

Newsletters

Once a month
get new photos
and expert tips.

Mont-Saint-Michel Light Show, France, 1998

Photo: Mont-Saint-Michel Light Show
"Light reflected from nylon thread near Mont-Saint-Michel illustrates triangulation, the method Jacques Cassini and his son César-Fran├žois used to survey 18th-century France. Starting from the Paris meridian, they sighted off high landmarks to accurately measure distance. At Mont-Saint-Michel, the lines of sight from four vantage points met in the apexes of three triangles at the steeple of the medieval abbey. By 1744 the Cassinis had crisscrossed the country with 400 such triangles."

—From "Revolution in Mapping," February 1998, National Geographic magazine
Photograph by Bob Sacha

Special Advertising Section

Photo: Horses and old barn

Enter Sweepstakes

Take a photographic journey through Montana and enter for a chance to win a trip for two!

Photo: Man carrying a kayak

Adventure Videos

Check out adventure videos from our West Coast Adventure Editor Steve Casimiro and go "Behind the Lens."

Photo Tip of the Week

Long Exposures

When making long exposures, use a remote release to avoid camera movement. If you don't have a remote release, use the camera's self-timer.

More Photo Tips

Photography DVDs

Photo: Photography DVD box

Get the stories behind the lens and experience photography at its best!

New Photo Books From National Geographic

Photo: Visions of Paradise book cover

Own the latest images from our world-renowned photographers!