Table of Contents
World Creation
World Design
Creating a Game World: A list of questions to answer when creating a game world.
City Design
City Design: Some useful (but very sparse) notes on city design.
City Features and Flavors: Tips on making realistic cities.
Medieval Maps: A collection of medieval maps of cities.
Buildings
A bunch of floor plans for palaces, castles, abbeys, etc.
Religion
Creating a Religion: A quick list of things to think about when creating a fantasy religion.
Creatures
Misc
Strolen's Citadel A large collection of locations, NPCs, items and other things you might want to include in your campaign.
Errant Dreams: This site has articles on character creation and world building.