There is,however,anoteher part of Paris which is silent and free from people 24 hours a day.Under the city are hudreds of kilometres of tunnels.there are sewers and old subways but there are also spaces of all kinds:canals and catacombs,wine cellars which have been made into nightclubs and galleries.During the 19th century,the Parisians needed more strone for buildings above the city.After that,many farners grew mushrooms in them.During world war II,the French Resistance fighters also used them.Since the 1970s,many groups of young people spend days and nights below the city in these tunnels.It's a place for parties,theatre performances,art galleries-anything goes here