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The rivalry great derby between Rangers and Celtic in Glasgow is know as the Old Firm. One of the most famous derby games in world football, played out between the two giants of Scottish football.
Football itself makes this an incredible game to watch, with Rangers or Celtic almost guaranteed to win the Scottish Premier League. The winner of the Old Firm games is likely to be the winner of the Premier League.
But that isn't all. Glasgow is a city divided by more than just football.
Glasgow is notorious for its sectarianism, with the city divided into two groups, Protestants and Catholics.
The green of Celtic represent the Catholic half of the city, whilst the blue of Rangers is seen as Protestant.
At any Old Firm you will see a vast difference between the Irish flag wielding fans of Celtic, and the Union Jack wavers from Rangers.
Football, politics and religion all add together to make the Old Firm the best derby match in Europe.