From Sugandha's house we did a small walk till Canary Wharf Pier. Pier is basically a boat station from where you can get into a boat to go from one place to another in London. These boats are quiet fast, cheap, comfortable and scenic. We spontaneously decided to do a boat ride to Greenwich, instead of the train or bus. And the boat ride was all worth it.
About a 20 minute walk from the Cutty Sark, is the Royal Observatory Greenwich. It has played a very important role in astronomy and navigation, however, it is best known as the home of the Prime Meridian, and the Greenwich Meridian Time, the GMT. An absolute must do here is standing on the Prime Meridian, because this is where you actually get to be in 2 different places at the same time! The observatory itself in situated on a hill which overlooks the Thames and has stunning views of the Canary Wharf, all for free.