There is some strange magic in this combination. The bustling with live and emotions Madrid can give you its own visual interpretations of the Discworld. It can do so to the almost unbelievable degree when you can find the characters and situations from the book on the very streets you are enjoying while sightseeing.
This city bends the universe around its flamenco, corridas, sun and smiling citizens. Even the basic laws of the universe as we know them are distorted by the extremely powerful atmosphere of this city. The easiest example: do you know what does E=mc^2 transforms into?
E=mucho callor^2
With the Making Money as my bed time reading, my experiences from the day get mixed with the magical world. So, my recommendation if you are reading Making Money is to do so while spending money in the midst of the Spain's capital.
