The @gallery directive generates a thumbnail gallery on a page where the thumbnails can be clicked on to show a larger version of the image.

So for example the Peak District page has:

  @gallery
  coventry_cobweb.JPG		Cobweb in Coventry
  pooles_cavern_1.JPG		Poole's Cavern
  pooles_cavern_2.JPG		Poole's Cavern
  crich_1.JPG		Crich Tramway Museum
  crich_2.JPG		Crich Tramway Museum

The images to display in the gallery are listed one per line after the @gallery directive, with a description of the image following the image filename.