Today we look at grotesque 1960s developments and wonder whatever it was that possessed the people at that time to impel them to bulldoze attractive and historic town centres and put up briefly fashionable carbuncles in their place.
It is similarly possible that generations of the future will look at the wind farms in the Welsh and English countryside and conclude that people early in the 21st century collectively lost their minds and wilfully blighted great swathes of the landscape.
They will be wrong in assuming everybody went mad, because there are those today who oppose the wind turbines both on the grounds of the visual damage they do to landscapes and also on the grounds that their benefits as energy generators are nothing like as impressive as they are cracked up to be.
For these heretics standing up to the green tide, the words of Energy Minister John Hayes will come as music to their ears. So far as wind farms go, says Mr Hayes, enough is enough. The country is peppered with them, he says. He is already on record as describing the turbines as a terrible intrusion.
With plans in the pipeline for new wind turbines in various parts of Shropshire, not to mention electricity pylons marching across the Shropshire and Mid Wales landscapes to connect Welsh wind farms to the national network, his comments are very timely.
And so is his decision to order a new analysis of the case for wind farms and their effect on local communities.
As for the latter, does anybody who lives near them actually like them? Their net energy benefits are hotly contested, but even on the headline figures they only meet a fraction of our energy needs.
One way of judging them is to look at them as they spin on the hillsides. And then ask yourself if they are worth the cost.