Most 18-minute videos on YouTube are dreadfully boring, but Curtis Paradis, avid Sims 3 user, puts on a stellar show speed-building the most elaborate house I've ever seen in a video game.
The house is elaborate. Lots of windows. Lots of furniture. It's basically a mansion, something I'd never have the money for in real life or the patience to make in Sim life. Well built, Curtis.
The Sims 3 - Building My Dream House [YouTube]