Cologne, in the far west of Germany, is the country's fourth-largest city, and the largest city in the Rhine-Ruhr Metropolitan Area. The city offers seemingly endless attractions including its spectacular cathedral which, in a number of surveys, has been voted to be the country’s single most popular tourist attraction. The Romans founded the city back in 38BC so don’t be surprised when, amongst the medieval buildings and modern architecture that fills the city, you also come across some Roman remains too. Cologne is also famous for its lively and colourful carnival that runs over the two days before Lent begins each year and features parades, performances and masquerades.