There"s more to the complex than the minaret. They include a 1,600-year-old 20ft-high Iron Pillar which has survived the ravages of nature and time, five arches and a tomb of one of the sultans. The buildings are decorated with Hindu and Muslim motifs. In his note, Mr Page said the group of monuments comprised the most notable historical remains of Delhi, both in terms of "antiquity and arresting design".