I would say that most of us in the LEGO community, at one time or another, have experienced the overwhelming compulsion to build something; from spaceships, to castles, to superhero figures, and of course, spaceships. Or, if you're like WTyler, the National Mall in Washington, D.C. Since his retirement from the video game industry several years ago, he's occupied his new-found free time with LEGO. Crossword puzzles and golf just weren't doing it for him.
Not having built with LEGO as a child, he was sucked into the hobby starting with the LEGO Advent Calendar, then on to the Architecture Series. That's where he really got to thinking, "Hey, I've got the Lincoln Memorial and the US Capitol, why not build everything in between?!?"
He's only a year into this ambitious four year project, but he's got a lot to show for it. Obviously there have been some challenges, like getting everything scaled correctly, and flying to D.C. to take his own pictures, since, according to Wayne, internet photos are notoriously unreliable. There are also plenty of custom modifications, redesigns, rebuilds, and figuring out new techniques along the way.