"No architectural style arouses more hostility than brutalism," writes Rich Heap. "People are quick to deride the unlovable concrete blocks it has spawned in cities across the world. It's terribly unfair."
"Last week, the [British] government granted grade II listed status to Preston Bus Station and three other brutalist buildings, and last week, English Heritage launched an exhibition in London called 'Brutal and Beautiful: Saving the Twentieth Century' to get people interested in this debate."
So which brutalist buildings are "beautiful" and worth saving? Here are Heap's Top 20 from around the world, starting with Preston Bus Station.