What should i build on minecraft? - 2

The Thirteen Towers
http://vignette2.wikia.nocookie.net/pandorastower/images/a/a2/Thirteen_Towers.png/revision/latest?cb=20120414223415

Your house/street, it can be a long build but it is really worth it. I made my street and used Google maps for references and measurements.

A castle, or fort, maybe army base, under ground hide out