London's New Year's Eve broadcasts traditionally show Elizabeth Tower striking midnight.
Elizabeth Tower is the clock tower at the north end of the Palace of Westminster. It is widely known by the nickname Big Ben, although Big Ben properly refers to the Great Bell inside the tower, not to the tower itself. The tower received its official name in 2012 in honor of Queen Elizabeth II's Diamond Jubilee.
The midnight chimes are a major part of London's televised transition into the new year. The city's large outdoor celebration also includes fireworks around the London Eye and along the River Thames.
A common mix-up is calling the entire tower Big Ben. For a question about the landmark itself, Elizabeth Tower is the precise modern name; Big Ben is the name of its principal bell.