The Biggest Empires in History Shown on the Map
The authors showed the territories of Roman, British, and Russian Empires in their best days.

Just the Flight published on their website an infographic which shows the territories occupied by the biggest empires in history on the world map — British, Russian, Roman, Mongol and the others — in their best days, Sploid writes.
There is a separate map for each empire, accompanied with short information about the territories, population, and the most famous rulers.
GeaCron, a company that specializes in history research, developed a map World History Atlas & Timelines Since 3000 BC earlier, which allows you to track changes on the political map of the world for the past 5,000 years.