The present sub-categories are only by region and not period. I would like to see a further level to make it easier to find exactly what you are looking for.
For example:
History/ Europe/ Roman
History/ UK/ Tudor and Stuart
I would also like to see a sub-category:
History/ UK/ Local History
as I'm not sure that 'Topography' is quite the right word here; I would like to see something more specific.