Not always on the average visit's agenda, the Tretyakov Gallery contains a collection of more than 100,000 Russian art works, it is said to be the best gallery for Russian art, which makes it worth a visit.Exhibits are almost entirely Russian, so it makes a good introduction to Russian culture throughout the ages. (and great for those into art history) Some of the works - religious icons - are from the 12th Century, and the gallery often put on rare, impressive exhibitions.