Starting from the fact that a great deal of the population in major cities is composed by people with mobility difficulty (people depending on wheelchairs or crutches, suffering from temporary or permanent deficiency diseases, old people, pregnant women, obese people, people of low stature and so forth), this article proposes reflecting on everyone's necessity of the urban experience. Listed are the ways that some existent barriers in the constructed environment may block People with Mobility Difficulty" (PMD) from experiencing the city, making it difficult to grasp the meaning of the space and affecting their behaviour."