When redditor officialvide showed Minecraft to his dad, his first order of business, after picking up the basics, was to recreate the NYC United Nations Headquarters in-game. Impressive for a WIP, and especially for a first project. Much fancier than a wooden hut, anyway. There are five more renders below.
Manhattan's Sony Tower, slightly modified, in Minecraft form. Built by Tiresh of Planet Minecraft, it's part of a larger, unreleased city map called The Capitol, which should look damn great when it's done, judging by Tiresh's other builds. Hi-res shots, interior shots, and ingame shots below, map download here.