The Royal Observatory (courtesy of Steve F-E-Cameron)

The Royal Borough of Greenwich is situated in southeast London, England. It takes its name from the historic town of Greenwich. Greenwich is world famous as the traditional location of the Prime Meridian, on which all Coordinated Universal Time is based. The Prime Meridian running through Greenwich and the Greenwich Observatory is where the designation Greenwich Mean Time, or GMT began, and on which all world times are based.

Central Greenwich Town contains a UNESCO World Heritage Site centred on Christopher Wren's Royal Naval College and the Old Royal Observatory.