The Royal Observatory Greenwich

Last weekend Caroline and I stayed with Matt and Dave in London who had recently moved there after having lived in NZ for a year. We met them during our travels in Australia. It was funny Australia is such a big place but we kept bumping into each other here (where I met Matt), here, here and here
Together we visited the Royal Observatory home of the Prime Meridian or 0º Longitude in Greenwich.

Anyway The Royal Observatory, home of Greenwich Mean Time and the Prime Meridian line, is one of the most important historic scientific sites in the world. It was founded by Charles II in 1675 and is, by international decree, the official starting point for each new day, year and millennium (at the stroke of midnight GMT as measured from the Prime Meridian).
More info on Greenwich Mean Time here and the Meridian Line here.