In the header, you will see a button that says ‘Photos’ – click that. Once you’re on the Photos page, you can narrow your search by category by clicking one of the categories in the left sidebar. You can also click the ‘newest’ or ‘sort order’ button on the top right of the page and change the sorting to Most Popular, Newest, Top Rated, or Most Viewed.
Please note that downloading photosets is not a function that is available for every site.