Plaza de toros de Las Ventas There are guided visits and they show you all the arena area and tell you about the history of this building. It is only 6 euros and the visits are programmed every half hour. The guides are friendly and will let you touch an original matador"capote" to take a picture.
The little shop is very interesting too.
But the jewell that few people know is the Museum inside. there are wonderful GOYA original drawings and wonderful sculptures by famous artists.