From the architectural point of view, the Puerta del Sol is a place of passage widened, oblong shape, a point of convergence of streets takes on the appearance of mid-century plaza XIX. lead in this space a dozen streets in the eighteenth century were eleven. La Puerta del Sol has been undergoing various urban improvement works throughout its history, the most important mid-century rush to XIX. In many cases urban action undertaken throughout its history has gradually removed important buildings of the past. Of these, the only survivor is the post office, which was the headquarters of the Ministry of the Interior (Interior) and the current location of the Community of Madrid. It is the oldest building in the Puerta del Sol actual. The second oldest is Lamb House, which throughout history has been changing the square of use.

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