Almost as interesting as it sounds, enter the Administracija building, knock or door Nº106 and ask the lady to let you in. Once she’s found the keys, taken you to the museum, realised she’s got the wrong keys and consequently goes to get the right ones, comes back again and let you in, give yourself at least two minutes for this rollercoaster of a museum adventure made up of half a dozen or so dusty sewage pipes, a couple of brushes for cleaning them with, a handful of water sanitation medals and a wall featuring a photograph of some of the people who’ve earned them.

Admission free.