The London Arena was an indoor arena and exhibition centre in Millwall, close to Cubitt Town area of Poplar, on the Isle of Dogs, in east London, England which was inaugurated in 1989 and demolished for housing in 2006.

The Millennium Dome was the original name of the large dome-shaped building on the Greenwich Peninsula in South East London, England, which housed a major exhibition celebrating the beginning of the third millennium. As of 2022, it is the ninth largest building in the world by usable volume. The exhibition was open to the public from 1 January to 31 December 2000. The project and exhibition were highly contentious and attracted barely half of the 12 million customers its sponsors forecasted, and so were deemed a failure by the press. All the original exhibition elements were sold or dismantled.