Answer:
Mansa Mūsā left a realm notable for its extent and riches—he built the Great Mosque at Timbuktu—but he is best remembered in the Middle East and Europe for the splendour of his pilgrimage to Mecca (1324)
Explanation:
The correct answer is "roads." John Loudon McAdam developed a method for building roads. <span>John Loudon McAdam </span>was a Scottish<span> engineer and road-builder. Because of that, he was invented a process of building roads with smooth hard surface that is called "macadamisation." It would be more durable and less muddy.</span>
