Rainbow over Niagara Falls in Ontario, Canada.
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/alexisjordanlewis/">Alexis Lewis</a>
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/alexisjordanlewis/27085325122/">Rainbow over the falls - Flickr</a>