de la Asunción, built in 1522. Groto of the Marvels Also located in the town is the Gruta de las Maravillas, one of the most spectacular cave systems in Spain. The caves are located below the hill on which stands Aracena Castle. Opened to the public in 1913, it includes a total of 2130 meters of subterranean passages. Several caverns and lakes are linked by these narrow passages. Coloured lighting adds to the effects of its unusual mineral formations. In the complex is a geological museum. The caves are said to have been found by a boy looking for a lost pig. Ham Museum El Museo del Jamón de Aracena (Ham Museum of Aracena) consists of 7 rooms which trace the history, cultures and traditions surrounding the famous Iberian pigs. Gallery References External links Official Web of Aracena in Internet - The Official Web of Aracena in Internet Aracena - Sistema de Información Multiterritorial de Andalucía - Natural Park Sierra de Aracena and Picos de Aroche http://www.discoverhuelva.com/town/aracena-0 Municipalities in the Province of Huelva