The options for browsing the catalogue are on the left of the home page above the 'newest additions' section. They can also be accessed from the dropdown Browse button to the right of the search bar. You can browse by:
•    Collection
•    Place/mill
•    Subject
•    Person/organisation
•    All items: Select this to bring up a list of the entire contents of the catalogue
•    All images: Select this to view all the images in the catalogue