The Tigris ran black with ink

In 1258 after a siege the Mongols captured Baghdad.  At that time the city was a center of Muslim culture and learning.  The Mongols destroyed mosques, palaces and hospitals and burned grand buildings to the ground.  

The Baghdad library contained thousands of books on such topics as medicine, astronomy, and history.  Observers said the Tigris River ran red with blood (it is estimated that hundreds of thousands of inhabitants were slaughtered) and black with ink from all the books from the Baghdad library that were destroyed 

Now we have a new Mongol horde, purportedly to be Muslim, but obviously knowing nothing of Muslim history or culture.  ISIS executes people, but as bad as that is, people can be replaced.  I know that sounds very cold, but it’s true.  What can’t be replaced are the cultural artifacts that ISIS is willfully destroying in areas it captures.  

I am certain that destroying the heritage of our world is not part of the Muslim religion.