The Millennium Dome, now known as the {O2 Arena}, is a large dome-shaped structure located in {Greenwich}, {London}. It was built to celebrate the turn of the millennium and opened to the public on January 1, 2000. The dome covers an area of 20 acres and was designed to host the {Millennium Experience}, an exhibition showcasing various aspects of British life and culture. After the exhibition ended in 2000, the dome underwent renovations and was transformed into a multi-purpose entertainment venue. Today, the {O2 Arena} hosts concerts, sports events, and other performances, making it one of the most popular venues in the UK.