Buildings, Cities

A city is an urban area that is differentiated from a town, village, or hamlet by size, population density, importance, or legal status. more...

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In most parts of the world, cities are generally substantial and nearly always have an urban core, but in the United States many incorporated areas which have a very modest population, or a suburban or even mostly rural character, are designated as cities. City can also be a synonym for "downtown" or a "city centre".

A city usually consists of residential, industrial and business areas together with administrative functions which may relate to a wider geographical area. A large share of a city's area is primarily taken up by housing, which is then supported by infrastructure such as roads, streets and often public transport routes such as a rapid transit system. Lakes and rivers may be the only undeveloped areas within the city. The study of cities is covered extensively in human geography.

Geography

The geographies of cities, both physical and human, are diverse. Cities are often coastal, with harbours for shipping, or situated near rivers to give an economic advantage. Water transport on rivers and oceans was (and in most cases remains) cheaper and more efficient than road transport over long distances.

Older European cities often have historically intact central areas where the streets are jumbled together, seemingly without a structural plan. This quality is a legacy of earlier unplanned or organic development, and is often perceived by today's tourists to be picturesque. In contrast, planned cities founded after the advent of the automobile tend to have expansive boulevards impractical to navigate on foot.

Modern city planning has seen many different schemes for how a city should look. The most commonly seen pattern is the grid, favoured by the Romans, almost a rule in parts of the New World, and used for thousands of years in China. Derry was the first ever planned city in Ireland, begun in 1613, with the walls being completed 5 years later in 1618. The central diamond within a walled city with four gates was thought to be a good design for defence. The grid pattern chosen was widely copied in the colonies of British North America. However, the grid has been around for far longer than the British Empire. The Ancient Greeks often gave their colonies around the Mediterranean a grid plan. One of the best examples is the city of Priene. This city even had its different districts, much like modern city planning today. Also in Medieval times we see a preference for linear planning. Good examples are the cities established in the south of France by various rulers and city expansions in old Dutch and Flemish cities.

Other forms may include a radial structure in which main roads converge on a central point, often the effect of successive growth over long time with concentric traces of town walls and citadels - recently supplemented by ring-roads that take traffic around the edge of a town. Many Dutch cities are structured this way: a central square surrounded by a concentric canals. Every city expansion would imply a new circle (canals + town walls). In cities like Amsterdam and Haarlem, and elsewhere, such as in Moscow, this pattern is still clearly visible.

Read more at Wikipedia.org