If we can include abandoned-before-completion there's this monstrosity in Pyongyang:
http://seeker401.files.wordpress.com...yong-hotel.jpg
It's a hotel meant to resemble a rocket and designed to provide room for thousands per night. This is in a country which only allows a few hundred visitors a year. With much of the population starving the government abandoned the project due to cost. And because the structure has been exposed for so long it may no longer be stable.
That is already number 2 on the original list.