The Silk Road book....What was the book and why did he write it?

The Silk Road was a book written by Marco to share his journey through China.  Marco talks about the amazing travel across the country and the people the trade and the cities he explored.  His travel was the most traveled, the most amazing because he did it on foot, and the roadways he discovered.  The path he took is now known as the Silk Road. 
   Marco actually wrote it to share but to also help a Group of religious people.  His book is still famous today and many people are amazed at his travel.