Gateways, entrances and doorways
The sense of arrival at places is important, and in recognition of this many cities and the buildings within them have elaborate gateways or doorways. Entry points are usually celebrated in this way except in the most utilitarian structures. At the other end of the scale, entry may consist only of a roundabout on a ring road or a collection of petrol stations marking an approach into a modern town. Historic towns, on the other hand, are normally well defined in terms of entry points, often because of the need for fortification in the past.