merchants and bankers and alex borg who were responsible for the industrial development and also benefited hugely from it. these days the textile industry no longer plays a big role in our sport where tourism has become a very important source of income there were 850000 overnight stays by visitors last year the figure has doubled over the past 20 years. you can find water everywhere in the old town of book like this will with spring water that you can drink. and this is the waterworks at the red gate it is the oldest preserved waterworks in germany. the off origins hope that one day the city's historical water management system will be declared a unesco world heritage site and attract more visitors. the ensemble of towers and well houses has supplied drinking water to the people of book for almost 500 years. paddle wheels over the canal helped transport the water up into the towers from there the fountains of the city were supplied with fresh water. today only the structures and the plants remain. but at the. last on the lake river you get an idea of how the people of book used their weal