Cobblestone
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Cobblestone is a natural building material based on cobble-sized stones, and is used for pavement roads, streets, and buildings.
Cobblestones on a road surface in Imola, Italy.
Italian cobblestone-covered street in Isola Bella. Cobblestones such as these are designed for horses to get a good grip.
A cobblestone lane in the Old Town (Senamiestis) in Kaunas.
The Alexander Classical School three-story cobblestone building in Alexander, New York.
Sett (paving)
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A sett, also known as a block or Belgian block, is a broadly rectangular quarried stone used in paving roads and walkways. Formerly in widespread use, particularly on steeper streets because setts provided horses' hooves with better grip than a smooth surface, they are now encountered rather as decorative stone paving in landscape architecture. Setts are often referred to as "cobblestones", although a sett is distinct from a cobblestone in that it is quarried or worked to a regular shape, whereas the latter is generally a small, naturally-rounded rock.
Setts are usually made of granite.
Laying setts in Edinburgh, Scotland, in 2013
Setts in pallet collars
The setts at the junction of Eden Street and Criffel Street in Silloth on Solway, Cumbria, UK
Samples of setts in Lysekil, Sweden, quarried and cut in Bohuslän, once a major producer of granite setts. The image has notations about the different types of setts; they can also be identified by an information board (in Swedish).