The party starts December 31 at 8p ET on CNN and the CNN app. | CNN

CNN's Nada Bashir explains how major protests and tension have erupted across Iran over the country's worsening economic crisis. Read more: https://cnn.it/49bID7X | CNN

Welcoming a new year in Times Square wouldn't be the same without the famous ball drop. CNN explores the history of this eye-catching ritual. | CNN