The "mother church" of Catholicism in Australia is St Mary's Cathedral, Sydney. The plan of the cathedral is a conventional English cathedral plan, cruciform in shape, with a tower over the crossing of the nave and transepts, and twin towers at the West Front, with impressive stained glass windows. 106.7 metres in length and a general width 24.4 metres, it is Sydney's largest church. Built to a design by William Wardell from a foundation stone laid in 1868, the spires of the cathedral were not finally added until the year 2000.