Last week, we explored some of the hardest-to-book rezzies in 7 cities around the U.S., and now it's time to take the concept international. We're talking about the most insanely hyped restaurants, where highly coveted reservations are booked up weeks, months or even a year in advance. Check out 12 of the world's toughest tables in the slideshow below, and get insider strategies for snagging a seat. Which restaurants would you add to the list? Let us know in the comments.