glass doors

Walking through the streets of Sofia is a great training for your eyes, because they have to be everywhere at the same time. You shouldn't only look at the ground, so that you can see the holes before you fall into them. You should also look ahead, especially when you pass by shops, because they use to have their doors open - if you don't watch out carefully, you may have a painful crash... And of course, don't forget to look to the left and to the right, because of the crazy car drivers! ;)