Informational (nonfiction), 1,165 words, Level U (Grade 4), Lexile 990L Multilevel Book also available in levels L and Z1 The massive stone ruins of Great Zimbabwe, a once-thriving city in East Africa, present many mysteries, including questions surrounding the functions of its well-constructed walls and buildings. Readers learn possible answers to these questions and about the remarkable building techniques used in the city.Informational (nonfiction), 1,165 words, Level U (Grade 4), Lexile 990L Multilevel Book also available in levels L and Z1 The massive stone ruins of Great Zimbabwe, a once-thriving city in East Africa, present many mysteries, including questions surrounding the functions of its well-constructed walls and buildings. Readers learn possible answers to these questions and about the remarkable building techniques used in the city.