The O2 Arena is a large indoor venue located in Greenwich, London, primarily used for concerts and sporting events. Opened in 2007, it has a seating capacity of up to 20,000 people, making it one of the most popular arenas in the world. The arena is part of the larger O2 entertainment complex, which includes restaurants, bars, and a cinema. The O2 Arena has hosted numerous high-profile events, including performances by famous artists like Beyoncé and Elton John. It is also home to the NBA London Game and various other sporting competitions. The venue is easily accessible via public transport, including the North Greenwich tube station.