Researches believe Swiss knight Adrian von Bubenberg, who is believed to have visited the holy city in 1466, may have marked his name alongside his family emblem on a stone ceiling.
War heaps misery upon Yemen’s heritage
Yemen's Sira Fortress withstood attacks by the Portuguese and the Turks, but years of war have left the 11th century citadel in disrepair, defaced by graffiti and littered with rubbish.
