If you thought the Starship Enterprise or the 16 bit ALU was an epic build in Minecraft, wait until you see this rendition of Bioshock's city Rapture. The map has been an enourmous project undertaken by the posters at Penny Arcade forums. Here is Part 1 of 2 showing the introduction to Rapture.
Double click the video to open in YouTube; check the description where they give the IP to actaullly walk through the map yourself. Here is Part 2.