It's a feeling when the blood circulates faster in the arteries and the adrenaline widens the pupils. This world, whose boundaries are only those in the head, and the environment bites, growls, hisses and kills. Those places you can not get to with a guide that you will not read about in diaries. Unknown people, so close, yet so far, millionaires, poor people, racists, communists, those filled with love and hatred.