Dagorlad has a great article on the architecture of Gondor, along with instructions for building models for your Games Workshop Lord of the Rings battlegames. It’s simply amazing how he breaks down still photos from teh movies and then translates them into miniature.
gondor
Middle Earth Paper Models
Games Workshop’s Lord of the Rings battlegame boxed sets come with some bits of terrain to get you started. This page has some paper buildings for Rohan and Gondor to keep you moving along.