Barracks are usually a group of long buildings built to house military personnel, laborers or prisoners. The English word originates from the 17th century via French and Italian from an old Spanish word "barraca" ("soldier's tent"), but today barracks are usually permanent buildings for military accommodation. The word may apply to separate housing blocks or to complete complexes, and the plural form often refers to a single structure and may be singular in construction. The main object of barracks is to separate soldiers from the civilian population and reinforce discipline, training, and esprit de corps. They have been called "discipline factories for soldiers". Like industrial factories, some are considered to be shoddy or dull buildings, although others are known for their magnificent architecture such as Collins Barracks in Dublin and others in Paris, Berlin, Madrid, Vienna, or London. From the rough barracks of 19th-century conscript armies, filled with hazing and illness and barely differentiated from the livestock pens that housed the draft animals, to the clean and Internet-connected barracks of modern all-volunteer militaries, the word can have a variety of connotations. History Early barracks such as those of the Roman Praetorian Guard were built to maintain elite forces. There are a number of remains of Roman army barracks in frontier forts such as Vercovicium and Vindolanda. From these and from contemporary Roman sources we can see that the basics of life in a military camp have remained constant for thousands of years. In the Early Modern Period, they formed part of the Military Revolution that scholars believe contributed decisively to the formation of the nation state by increasing the expense of maintaining standing armies. Large, permanent barracks were developed in the 18th century by the two dominant states of the period, France the "caserne" and Spain the "cuartel". The English term 'barrack', on the other hand, derives from the Spanish word for a temporary shelter erected by soldiers on campaign, barraca; (because of fears that a standing army in barracks would be a threat to the constitution, barracks were not generally built in Great Britain until 1790, on the eve of the Napoleonic Wars). Early barracks were multi-story blocks, often grouped in a quadrangle around a courtyard or parade ground. A good example is Berwick Barracks, which was among the first in England to be purpose-built and begun in 1717 to the design of the distinguished architect Nicholas Hawksmoor. During