I was recently at the NY Public Library. I (gasp) had never been inside before and went with a couple friends who were in town. Besides seeing the awesome ceilings and amazing wood work, there were two lego lion sculptures by Nathan Sawaya at the entrance. They use more than 60,000 standard gray lego blocks.
Look at that texture! Yum. I really wanted to touch it, but the security guard at the door was eyeing me somethin' fierce.