The Farol de Felgueiras (or Felgueiras Lighthouse) near Porto, Portugal, gets some massive waves during winter storms. This photo is actually a combination of two images: the original showing the wave topping the lighthouse, and another to introduce lower waves in the foreground. It was taken in January 2013 and was made a Photo of the Day by National Geographic.
Note to self: This winter, get to the coast during one of those storms.
(Click on the image to embiggen. The download button is just below the photo on the NG page.)