The Cannabis College is located in the Red Light District of Amsterdam on the main canal of the Oudezijds Achterburgwal. They offers free advise on the safe use of cannabis, both for recreational and medicinal use.
In addition they also educate the public on the many industrial uses of the hemp plant and try to provide for as much objective infomation about cannabis. It's a non-profit foundation with as a goal to bring information into the debate on cannabis
They also offer the abbility to test cannabis, so you get to know exactly what is in the cannabis you bought. You can even have your space cake, brownies or muffins tested here, so you know what you're taking in.
So if you're really interested in getting to know more about cannabis, or you're planning to use cannabis but want to know if it's safe to use, this is definetely the place to go to.