This classic account shows how the fall of Constantinople in May 1453, after a siege of several weeks, came as a bitter shock to Western Christendom. The city's plight had been neglected, and negligible help was sent in this crisis. To the Turks, victory not only brought a new imperial capital, but
The way to do it is piecemeal. You could just sit down and try reading Roberts's History of the World cover to cover, but you'd probably lose interest. I think it's a better plan to read books about specific topics, even if you don't understand everything the first time through.
Here are the most exciting ones I can think of.