I know I've posted pictures of this place before, but the full-size version of this picture (unlabeled) gives me a weirdly vertiginous feeling. The source article is linked above; a click on the picture below will go to the full-size version. For those who haven't heard before, Medano Creek has a strange property (when it's flowing, mainly in the spring) due to the sandy bed; it pulsates. The sand bed constantly builds up little dams and bars, that break down with the water flow, sending waves downstream. An Ocean in Colorado? (note link to cartoon animation) Here's a nice picture...