Earlier this month, U.S. authorities shut down the Silk Road after its alleged operator, Ross Ulbricht, was arrested.
The Silk Road was a very successful online marketplace where people bought and sold illegal goods - from drugs to forged documents, firearms to exotic animals - without getting caught.
It existed in a hidden corner of the Internet called the "Deep Web."
But who built the Deep Web and why?
Click on. The answer will surprise youâ€¦