OK, I admit it. I like to build Lego models, too. I find them to be a relaxing sort of challenge very different from my work. My collection dates back to the mid-eighties, starting with several space sets. These expanded into Technic, Castles, Town, and others. When my son Michael came along we started building models together. To this day, he enjoys the space and technic sets, meanwhile, my facination have turned to trains.
Each year at christmas time I build a new train layout using various train sets, buildings, etc.
This year, I re-created Harry Potter's world including the Hogwarts Express train, Charing Cross
Station, Diagon Alley, and Hogwarts Castle.