Here are two creations made from Legos that almost seem like works of art. The first is called "Steam Castle Falls" that was shown off at an expo in Rosheim, France. Created by Arnaud Besson, Olivier Curto, and Jimmy Fortel, the wonderful creation is made up of over 20,000 Legos and took over four months to build. The result is a diorama that is just full of medieval details and design. Click here for pictures or more at the links for each buidler's flickr accounts.
The other awesome piece is a re-creation of One World Trade Center complete with light effects. Design by Lego Discovery Center in Westchester County, New York, the piece is 12 foot tall, 110 pounds and comprised of 4,873 bricks. More images of it can be found here.