O is for the O2

The O2 is a large entertainment complex on the Greenwich peninsula in London. It was built largely within the former Millennium Dome, thus The Dome remains a name in common usage for the venue.

The site comprises an indoor arena, a music club, a cinema, an exhibition space, piazzas, bars and restaurants. The Arena alone has a capacity of up to 20,000 depending on the event, and is reportedly the busiest music venue in the world.