I begin with Greenwich, because it is the closest London day tripย andย because I truly loved my visit here. Most of you probably associate the name Greenwich with the International Time Line, and yes, you would be correct in thinking that this is indeed, where the International Time Line originates. All of our time is measured from theย Prime Meridian Lineย locatedย outsideย of theย Old Royal Observatory. Straddle the line with your legs and both legs will be in different time zone!