Chichester is an old Roman town. In the centre of Chichester are four main streets: North Street, South Street, East Street and West Street. These four streets meet in the centre, where there is a small round building with a cross: the Chichester cross. The four main streets form an area which is mostly pedestrianized. Chichester Cathedral stands near the centre, between West Street and South Street. Further to the north lies the area of Summersdale and the conservation area around Graylingwell Hospital. South of Chichester is a canal which links the city to the sea. Soon after it was built in the 19th century the railway came to Chichester so that the canal was not used for long. The canal was left in a bad state for many years until, more recently, it was restored. Some of it can be used by small boats, and there are reedbeds where birds can breed.