High Quality Content by WIKIPEDIA articles! The O2, visually typeset in branding as The O2, is a large entertainment district on the Greenwich peninsula in South East London, UK, including an indoor arena, a music club, a cinema, an exhibition space, piazzas, bars and restaurants. It was built largely within the former Millennium Dome, a large dome-shaped building built to house an exhibition celebrating the turn of the third millennium; as such, The Dome remains a name in common usage for the venue. It is often confusingly referred to by various names: the O2 Dome; the O2 Centre (incorrectly as this is actually a shopping centre in Finchley Road); or The O2 arena which properly refers to a smaller indoor arena within The O2. Naming rights to the district were purchased by O2 plc (now Telefónica Europe plc) from its developers, Anschutz Entertainment Group (AEG), during the development of the district.