A massive city in multiple locations. It contains:

7 Story Castle fully furnished
84 enterable buildings-fully furnished
117 total buildings
A sewer system underneath
secret passageways underground and in buildings
a massive ingame map to show location in the city
4 maxed beacons add regeneration to fresh spawns
a dungeon completely furnished with end portal
2 nether portals, one in the lighthouse the other underneath the castle
Complete spawn home in the castle for new players
multiple buildings allow for an interesting economy and allow for more player movement

Total time to complete without MCEdit -4 months