The Eagle pub where in 1953 two young scientists, an American, James Watson and an Englishman Francis Crick announced that they had "discovered the secret of life". (The structure of DNA).

Here, during the Second World War, air crews from the United States Airforce and the Royal Air Force drank between missions and signed the names and numbers of their squadrons on the ceiling.

The pub also has two ghosts.

The Old Cavendish Laboratory, home of 30 Nobel prizes for science - including the one won by Crick and Watson.

This was Cambridge's first Laboratory of Experimental Physics - a most alarming concept when it open in 1874. One Cambridge don said: "Students should not experiment. They should just believe what their teachers tell them."

St John's College was founded by the grandmother of Henry VIII (the king who had six wives) in 1511. Here studied William Wilberforce, the Member of Parliament who finally got the legislation passed to end the slave trade in the British Empire in 1807. Many freed slaves, who had become authors and orators spoke here.

Part of the D Day landings was planned here. One of the students here was Roger Needham, the scientist who invented the password for computers. We should forgive him.

This is the University Church but also used by the people of Cambridge. Stephen Hawking's funeral was here. It was the first place the students came 800 years ago in 1209 at the start of Cambridge University. It was once the formal meeting place of Cambridge University and where its documents were stored.

Thus it was also the place that during the Peasants Revolt in 1381, the townspeople stormed in, took the chests of university scrolls, carried them to the nearby market square and burned them.

King's was founded in 1441. It has the largest private chapel in the world, which took 100 years to build because (during the War of the Roses) it went through the reign of five different (very different) kings.

This was the college of the father of computer science, Alan Turing, the economist John Maynard Keynes, and the authors: Salmon Rushdie, Zadie Smith, Rupert Brooke, M R James and E M Forster.

The extraordinary clock on the outside of Corpus Christi College. It is covered in gold, cost a million pounds, has no hands and is only truly accurate every five minutes.

Its symbolism is about the passing of time and indeed we are coming to the end of our tour.