David R.
Yelp
While not a major Barcelona tourist attraction, this fun little museum is a nice change of pace from all the grand medieval and modernisme art and architecture in the city. You may learn a lot, or only a little, but it is interesting and unique, and the value of the ticket price is good. And who doesn't love a little xocolata? Your museum ticket is also a chocolate bar!
The museum is divided into several sections through which it is easy to proceed in a unified flow. The front gallery are artifacts and placards detailing the cultural, commercial, and technological history of chocolate, from Mayan times to the industrial age. On the outside wall in the same long room are display cases featuring some modern chocolate creations, such as a Don Quixote scene, a Ben Hur scene, St. George and the Dragon, the Gaudi lizard from Parc Guell, et al (see photos).
Further along is a series of audiovisual rooms, each with a short presentation on the history of chocolate to complement the static displays preceding. Towards the back are some placards and photographs describing the great pastry artists and chocolatiers of Barcelona's past and present. Also in this section you will find old chocolate-making machines.
If the ticket-chocolate is enough to satisfy your sweet tooth, you have a free bit to take with you (or to eat whilst perusing the exhibits, if you can't wait, like some people I know). If not, the front of the museum, at the beginning and end of the loop, is the museum shop, where you can purchase all types of chocolates and truffles. It's not as if you can't buy candies all over town, but since you probably have a xocolata jones after spending all that time in the museum, why not...