Today we went to St Paul's Cathedral in the morning via the underground train.St Paul's Cathedral was where Charles and Di got married.

Following this we caught a City Cruise ferry to Greenwich along the Thames river. The cruise took about half an hour and took in some great sights along the Thames - including some notable pubs along the river as well as numerous apartment buildings. It certainly is worth a trip. The only unfortunate thing is that you cannot access these historic pubs along the way. However, you can see how much development there has been along the Thames.

Greenwich is known for two notable things - the Royal Observatory and the National Maritime Museum.

The Royal Observatory at Greenwich is the home of Greenwich Mean Time - GMT - and is the prime meridian of the world. You can actually straddle two hemispheres in the Meridian Courtyard. It is filled with astronomy history and numerous devices developed over the years about how longitue and latitude were discovered.

At 1pm every day, there is a red time ball at the top of the Observatory that drops continuously, as it has done since 1833 - this is the actual measurement of time for the world all over.

The National Maritime Museum owns the uniform coat that Britain's greatest sea faring hero - Horatio Nelson - was wearing when he was fatally shot.

The actual town of Greenwich is quite nice - there was a market operating today due to the public holiday and we had lunch at one of the 40 local pubs. Instead of catching the ferry back to London, we caught the train and went to the Tower of London for the afternoon.

The Tower of London is in fact a castle and has been the property of the monarch here since it was begun during the reign of William the Conqueror in 1066-1087. It certainly is a well preserved medieval castle and it attracts over 2 million visitors a year!!!

We arrived late in the day - at 3pm - to avoid the crowds and it worked out well. We took the tour of the local Yeoman Warders - known as Beefeaters - and got a real history of the place. These "Beefeaters", while officially they guard the tower and Crown Jewels at night, their main role is to act as a tour guide - apparantly to become a Yeoman Warden, you have to have served in the Army for over 22 years.

The Tower of London is home to the Crown Jewels - a very slow moving travelator takes you past the dozen or so crowns that are the centrepiece - reputadly worth over 27.5 million pounds!!!

We spent a couple of hours at the Tower of London, before returning to our hotel - it has been a long day and we have been on our feet for nearly 9 hours. Time for a hot bath and a rest.

We had dinner at a local restaurant and decided to have an early night. Tomorrow we need to work out what we plan on doing for the remainder of this week, before heading to Paris on Sunday.