in a Catholic background; 61.47% indicated that they had a British national identity, 30.76% had a Northern Irish national identity and 11.56% had an Irish national identity (respondents could indicate more than one national identity); 35 years was the average (median) age of the population. 8.43% had some knowledge of Ulster Scots and 5.20% had some knowledge of the Irish language. Landmarks Shane's Castle and Antrim Castle In the north of the town is one of the most perfect of the round towers of Ireland, 93 feet high and 50 feet in circumference at the base. It stands in the grounds of Steeple, where there is also the "Witches' Stone", a prehistoric monument. There was a Castle, near the Six Mile Water, which was destroyed in a fire in 1922. All that remains is an octagonal tower. The river allowed the linen industry to be established. The linen industry has been replaced by a Technology Park, the only one in Northern Ireland. Antrim Market House is a 2–story building, nine bays long, three deep built in 1726. Formerly a Court House, it has recently been refurbished and is currently used as a tourist information centre and has a small theatre and café. The Castle Grounds, that is beside the Antrim Castle. The Springfarm Rath Transport Antrim railway station was opened on 11 April 1848, and closed for goods traffic in 1965. Served by passenger trains on the Belfast-Derry railway line are run by Northern Ireland Railways. Antrim's Aldergrove Airport known as Belfast International Airport is the largest airport in Northern Ireland, serving destinations in Britain, Europe and North America. However, Aldergrove does not have a proper Airport rail link connection. Retail The Junction, formerly Junction One (named after junction 1 of the nearby M22 Motorway), is a retail park in the area with restaurants and a hotel. Supermarkets serving the town include an Asda store, Lidl outlet, Tesco Extra, and Iceland store. Castle Mall, located on High Street in the town, was formerly known as Castle Centre. It has a selection of every day shops, including the town's main Post Office. Education Junior schools serving the area include Antrim Primary School, Ballycraigy Primary School, Greystone Primary School, St Comgall's Primary School, and St Joseph's Primary School. The secondary schools are Antrim Grammar School and Parkhall College. The Greenmount campus of the College of Agriculture, Food and Rural Enterprise (CAFRE) is