The longest-running Broadway show is "The Phantom of the Opera." Written by Andrew Lloyd Webber, this iconic musical premiered in 1988 and has captivated audiences with its haunting story and memorable score. The plot revolves around a mysterious figure, known as the Phantom, who lives beneath the Paris Opera House and falls in love with Christine Daaé, a talented singer. "The Phantom of the Opera" became a cultural phenomenon, celebrated for its elaborate stage design and music, and has been performed in multiple countries, solidifying its legacy in theater history.