Of course the classic example of 'build a big building to look good, but so poorly that it will never really be usable' is the North Korean Ryugong Hotel. https://en.wikipedia.org/wiki/Ryugyong_Hotel
We are in another age now though. I'm not sure anyone will quite reach the same levels of stupidity.
There aren't any pictures of the insides however so this might be a classic case of North Korea "Look What It Looks Like On The Outside" that we're supposed to believe.
We are in another age now though. I'm not sure anyone will quite reach the same levels of stupidity.