Their 2015 hiatus announcement after the On The Road Again tour was bittersweet, but we knew it wasn't goodbye forever. Discover 10 legendary moments that made One Direction a global phenomenon! #OneDirection #1D #OneDirectionReunion #1DFamily #HarryStyles #NiallHoran #LiamPayne #LouisTomlinson #ZaynMalik #10YearsOf1D