Welcome to Operation Keeping the Castle(KtC), the code name for a hopefully long-term collaborative effort to improve Wikipedia's coverage of castles. If you want to participate (and help this endeavor graduate from the Incubator), just add your name to the list of editors. If you have any questions, comments, concerns, quandaries, suggestions, etc., feel free to leave them on the talk page and I (and hopefully in the future "we") will get back to you.
The primary goal of KtC is to create a wall of featured topics around fortifications–namely, castles and the parts that make them up (bastions, murderholes, outer and inner baileys, etc.). There are likely hundreds of articles that will will thus be included, from the earliest keeps to the final castles built for occupation by noble families and their retinues.
Phase I
Castles: all castles are included in this phase, along with their respective class articles. This will be broken down by nation, alphabetically.
Phase II
Architecture: all components of the castles: gatehouses, towers, baileys, various types of towers, courtyards, the whole shebang.
Phase III
Historical highlights: this phase will address battles and sieges where castles were involved, regardless of time period.
Phase IV
Biographies: Those who built castles, those who besieged or defended castles, those who destroyed castles, and those who restored them.
Phase V
Miscellaneous: Anything that doesn't quite fit in the above Phases.