Man, Legos sure have gotten more advanced since I was a kid. I used to build spaceships and space bases all the time, but none of them actually did anything without me picking them up and pretending they were sentient. But these days? You can basically build fully-functioning robots and vehicles with Legos.
Check out this amazing bridge maker, for example. It can approach a gap and automatically extend a bridge to cover it. It then crosses the gap on its bridge, picks it up and carries it away on the other side. And this is made with Legos! It's stuff like this that proves that I was born 30 years too early.