When you're a kid, building a Lego fortress that can withstand attacks from G.I. Joe and Transformers is a real accomplishment. As an adult, you need a bigger challenge, and that's what Lego's 3,929-piece Technic Bucket Wheel Excavator set provides. It's the most work I've ever put into building a toy, but the resulting edifice makes you feel like you deserve a job at Legoland.