The worst modern art museum architecture I have had the misfortune to visit is the Kiasma, Helsinki, Finland. All concrete (so green!) and designed so that any little sound anywhere is carried throughout the building and amplified. The exhibits were literally trash as well. 
I usually ignore these failed buildings as best I can, but the contrast with the rest of Helsinki, which is very beautiful and one of the nicest collections of art deco buildings in the world, makes it so extra infuriating. Finns deserve better.
Look at the giant statues framing the entrance to Helsinki Central Station! It makes you feel like an explorer stepping into some abandoned Tolkieneseque Kingdom! Clad in Finnish granite! And look at the art deco Burger King restaurant... they don't know how lucky they are.
Back to the Kiasma: who approved of this business plan?
"I want to stare at literal garbage while in a concrete shell where I can hear ever cough snort or fart in the entire building. And, I want to pay €15 for this privilege. Where do I sign up? How can we make this happen?"
"I want to stare at literal garbage while in a concrete shell where I can hear ever cough snort or fart in the entire building. And, I want to pay €15 for this privilege. Where do I sign up? How can we make this happen?"
