Modern sewer system

1859 – the first modern sewer system was built in London.

By the way, it was the year of the “Great Stink” and this was the main reason for the sewage system to be built. During the same time, the Big Ben was also constructed.

Source: https://www.guetsel.de/content/guetersloh/43254/der-mensch-und-sein-muell-terra-x-doku-im-zdf-ueber-die-geschichte-des-wegwerfens.html