It marks the Formal center of Madrid. Seek out the “km 0” plaque on the bottom, and that is where all distances in Spain are calculated from. It’s one of several prime monuments in Spain and no cost to go inside, however , you’ll need to order tickets on https://organising-conventions-an66532.blogginaway.com/36447682/not-known-facts-about-fairs-in-madrid-ifema-madrid