The pal we were visiting in Toronto suggested that - after touring a pleasant local park and being entertained by the birdsong - we might like to visit the local water treatment works.
'We've only got three days,' we said. 'Sorry, but it just doesn't appeal. Isn't there somewhere else... an art gallery, perhaps?'
He persisted. He practically begged. Not wanting to offend him, we relented, and he drove us to the RC Harris water treatment plant.
Well, thank goodness he was so insistent.
It's beautiful. Magnificent old brick-built temples to industrial innovation, stylish and elegant architecture, birdlife everywhere (with endless nesting options beneath the needlessly ornate fripperies on the buildings' facades), mighty views, fresh air and living history.