Professor Richard Bulliet at Columbia University will teach you

the history of the world in 46 lectures. The first course, 

History of the World to 1500 CE (available on YouTube and iTunes Video).

It takes you from prehistoric times to 1500, the cusp of early modernity.

The origins of agriculture; the Greek, Roman and Persian empires;

the rise of Islam and Christian medieval kingdoms; transformations in Asia;

and the Maritime revolution ? they?re all covered here.

In the second course, History of the World Since 1500 CE (find on YouTube),

Bulliet focuses on the rise of colonialism in the Americas and India; historical developments in China, Japan and Korea; the Industrial Revolution;

the Ottoman Empire; the emergence of Social Darwinism;

and various key moments in 20th century history.

Source:

http://www.openculture.com/2013/04/the_history_of_the_world_in_46_lectures.html