Restricting access by URL

Hi, I would like to be able to partition parts of my site off to specific roles, I want to be able to restrict all the content (panel pages, views, nodes e.t.c) within a certain url for example www.blah.com/london which would be paid for and tied to a specific role. The idea would be for the user to buy in each specific area so one user might buy access to /london and another to /paris.

Does anyone know how I can do this or suggest a way to do it better?

Thanks