You can find a word (or short phrase) that occurs anywhere in the website, including in the descriptions of photos. First type the word you want into the nearest Search box. Then click the magnifying glass. That will produce all the relevant items, one after the other. For instance type in Trafalgar Square, click, and everything that mentions Trafalgar Square will appear. As usual, any photos will appear first and interviews last. For long items, where you can’t actually see your words at first, you can click “continue reading” when asked, and look for Trafalgar Square in the next section.