El Ateneo Grand Splendid, Buenos Aires

It's a great tourist attraction, most beautiful library you will probably visit. The experience is incredible, and if you love books you can spend hours walking around them in a really nice atmosphere (there's even a small section of english books). The people there were really helpful, both in the library spaces and in the cafeteria. This is definitely a must visit place in Buenos Aires! You can spend a few minutes just to take some pictures if you're not so much into the book shopping, or you can spend one or more hours just looking at books or taking a coffee in what used to be the theater stage. On the downside, the book selection can definitely be improved specially in specific areas, so if you are looking for technical books, or a more specialized library there are better places.

A good place to go for a visit. Overall it is impressive that they could adapt a library within a theatre/ opera structure. However, I wouldn't go there if you were short in time or if you're not much of a library fan It may be a little far from other points of interest and you'd probably spend little time if you're only looking for sightseeing spots in Buenos Aires.