Once upon a time, there was a world without sheet masks. And although it might be hard to imagine this world, just a few short years ago, sheet masks were not a staple on the beauty aisle. Now, they've gone above and beyond the serum-soaked cloth masks of the past. Today's next-level mask contain crazy ingredients, are used on parts of the body we never even considered, and look as Instagrammable as ever. In honor of these over-the-top masks, we've rounded up some of our favorites for your viewing pleasure.