Church Square in central Pretoria was the site of the city's first church, built in 1855. During its early years, the square was used as a marketplace and sports field and today is the grandest civic square in the city and among the great attractions in Gauteng. For visitors who adore 19th century and early 20th century architecture, Church Square is one of the must-see places to visit in Gauteng. The square is surrounded by historical buildings in varying neo-classical architectural styles, including the impressive Palace of Justice where former president Nelson Mandela and several of his comrades were tried and charged for treason during the infamous Rivonia Trial, the Old Capitol Theatre and the Ou Raadsaal (Old Government) building. Other notable buildings include the Old Nederlandsche Bank building, home to the offices to Tshwane Tourism and the General Post Office, which was erected in 1910.