it still boggles my mind that Rome has working sewers that were constructed more than 2000 years ago and there is every indication that they will last another 2

it still boggles my mind that Rome has working sewers that were constructed more than 2000 years ago and there is every indication that they will last another 2000 years of continuous use http://www.bbc.co.uk/programmes/b05xxl4t http://www.bbc.co.uk/programmes/b05xxl4t