This is the main entrance to St John's College.
Look out for the Yales holding the coat of arms above the door. Yales are mythical beasts with elephants' tails, antelopes' bodies and goats' heads. They can swivel their horns from back to front so when they fight they keep one horn forward and one in reserve.
The coat of arms belongs to the foundress of the College, Lady Margaret Beaufort. She was Henry VIII's Grandmother. The Red Rose of Lancaster and the Portculis are the motifs of the Beaufort family. They were used a lot by the Tudor monarchs and so they are now part of the heraldry of England itself. Can you think of any other places you have seen them?