Lightbox

<figure class="photo">
  <a class="lightbox" href="path/to/image" title="Image title">
    <img src="path/to/image">
  </a>
</figure>

<div class="gallery">
  <figure class="photo">
    <a href="path/to/image" title="Image title">
      <img src="path/to/image">
    </a>
  </figure>
  ...
</div>