For those people who lack the patience in putting together jigsaw puzzles, Mike Henry of Nevada is definitely not one of you. Henry has put together large puzzles in the past, but none as large as the 18,240-piece puzzle he is putting together now. In fact, the puzzle Henry is working on doesn't get any bigger as the manufacturer lists it as the world's largest puzzle.

The puzzle of four historical maps measures six feet by nine feet and overflows a ping-pong table in Henry's home. Henry has been working on the puzzle since November of 2003, just finishing the main picture this past March. Henry says the routine for putting the puzzle together consists of him spending about two hours every night going through the piles of pieces and putting together what he can, which usually only results in one piece. "If you're on a roll you get two or three," said Henry.