The Hash, Marijuana & Hemp Museum is the oldest and most important museum in the world dedicated to Cannabis Sativa L., also known as hemp or marijuana. The Barcelona location is one of two dedicated to Cannabis Sativa L. with the other being in Amsterdam. It is important to note that the possession and use of cannabis in Barcelona is illegal. This museum does not promote the use of cannabis but merely tracks it’s historical and scientific role this plant has made. The museum manages and exhibits a unique collection that encompasses all aspects of cannabis, functions as a knowledge centre, facilitates scientific research and plays an important informative role. They also have rotating exhibits that feature a unique period of history related to cannabis. In Barcelona, the museum is located in the Palau Mornau area, in the Gothic Quarters, a historical monument area that is also part of the Modernisme Route, an itinerary that takes you through the Barcelona of Gaudí. The museum is open to the public daily but only the first level is free of charge. To see the rest of the museum it is € 9 but you can save 5% if you purchase ahead of time online. The staff are very knowledgeable and are true activists. The museum does an excellent job exploring the significant and role cannabis has played through history, in the arts and most importantly through science. It is worth a stop in to the first floor at least to see this unique building and chat with the staff.