Photograph by Frederick Allstetter, Seattle, WA
Camera: Canon EOS Rebel T3i
Lens: Canon EF-S 18-55mm
ISO: 400
Aperture: f/10
Speed: 1/100
Focal Length: 18mm

And this is how I discovered that the Arc du Carrousel, the Pyramide du Louvre, and the Louvre itself are not perfectly aligned!