The ancient Pont Valentre crosses a loop in the Lot River at the city of Cahors in southwestern France. The tower in the middle of the river of this fortified and impregnable bridge was held even when the surrounding city was overrun. I recently converted the image to black and white (click here to see the color version and blog story) for a chapter on black and white workflow in a new book I have started to work on.

Related stories: Valentre Bridge; Impregnable.