Manchester's buildings display many different types of building styles, from Victorian to contemporary architecture. The very common use of red bricks characterises the look of the city. Much Manchester's architecture dates back to its days as a global centre for the trade of cotton. Just outside the city centre is a large number of former cotton mills, some of which have been left mostly untouched since they were closed, while many others have been turned into apartment buildings and office spaces.Manchester Town Hall, in Albert Square, was built in the gothic revival style and is thought of by many to be one of the most important Victorian buildings in all of England.