For as long as humans have lived in settled communities, some groups have sought to assert dominance over others, and through history the biggest empires grew to cover millions of square miles.

But what were the largest and most powerful empires throughout history? These are some of the world's biggest empires. We ...

For as long as humans have lived in settled communities, some groups have sought to assert dominance over others, and through history the biggest empires grew to cover millions of square miles. But ...