ALEXANDRA PALACE, Muswell Hill, London. Alexandra Palace was built in 1873 as a North London counterpart to Crystal Palace in Sydenham, South London. Set in Alexandra Park it was intended as a venue for public recreation, education and entertainment. It contained a concert hall, art galleries, a museum, lecture hall, banqueting room and a theatre. In 1936 it was used as the television headquarters of the BBC. The BBC radio mast is still in use as shown in this aerial photograph from August 2006.