The Biarritz lighthouse is in the deep southwest of France -- in fact, on clear days, you can see Spain from there. Plus, Biarritz has some great beaches. So it's well- and oft-photographed. It's a classic white tower, nothing fancy or unusual, but very prominent.
Here's a bit more from this Web page (with a map):
"The lighthouse of Biarritz stands on Saint Martin Point. It is a 44 m tower that was built between 1830 and 1834. From its upper deck (248 stairs to climb!), a wonderful 360° panorama opens to the visitors eyes and on a clear day even the i the Spanish city of Saint Sebastian can be seen on the horizon!"Here's a page with more technical info, translated from the French: Biarritz Lighthouse
Below, this week's pictures: