Tiwanaku, Bolivia: The mysterious collapse of a once-great city of civilisation, by Gift Luckson High in the desolate, windswept Altiplano of western Bolivia—over 12,500 feet (3,800 meters) above sea level—lies Tiwanaku (often spelled Tiahuanaco). Long before the Inca carved out their famous empire, Tiwanaku was the thriving capital of a powerful pre-Columbian civilisation that dominated the southern Andes between 500 CE and 1000 CE. ​It was a city born of harsh conditions, designed with staggering astronomical precision and engineering that still leaves modern stone masons scratching their heads. READ ALSO: William Ansah Sessarakoo: The...