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The 12th-century Agricola Tower was the first stone gateway to Chester Castle, which had been founded by William the Conqueror in 1070 in the south-west part of the city. On the first floor is the chapel of St Mary de Castro, which contains some exceptionally fine wall paintings from about 1240. By climbing the nearby stairs to the wall-walk, you can appreciate the castle's position within the city.
Chester Tours run charged guided tours; the "Secret Tour" includes a visit to the Castle and Agricola Tower. There are two tours per month departing from the Town Hall Visitor Information Centre on the first Tuesday and third Friday of the month at 11.30am, between the beginning of April and the end October. Visit their website for more information.