The Upside Down Waterfall is not your usual waterfalls. Flowing over the edge of a cliff on Mount Konahuanui, powerful northeasterly trade winds, channeled by the location's topography, catches the falling water and draws it up the Canyon even before it reaches the bottom, creating the illusion that the falls is flowing in reverse (watch the video below).
This unique and gravity-defying wonder is only visible along the Pali Highway during wet season, especially after heavy rains, and in the presence of strong winds. There is no lookout platform so it can only be viewed inside the car while driving along the highway, eastbound direction towards Kailua. The falls is on the right hand side of the road.
Photo credit Mike Roberts.