This website has a very powerful search function that uses keywords I have entered about each image. Secondarily, it searches file names, album titles and image captions.
If you search for "tuscany," it will show all images with Tuscany in the image title or keywords. If you enter two words (tuscany trees) in the search box, the search returns all images on the website of tuscany OR trees.
If you add a "-" in front of Trees, i.e. "tuscany -Trees, the search will return all images of Tuscany, excluding any Tuscany images with trees. To search a string of words as if it were a single term, wrap it in either single or double quotation marks, i.e. "U.S. Capitol dome" to search for all images of the dome of the U.S. Capitol.
