
I thought that was pretty cool, until I read about the Ryugyong hotel in Pyongyang. It is the largest unoccupied building in the world, slightly taller than the Salesforce tower. The White Elephant is a hotel built in 1987 that has never had a single guest. Until recently a painful eyesore, it has been transformed with 100,000 led's into work of propaganda:

Using your country's largest visible failure as the billboard to trumpet your successes makes this the world's tallest metaphor for a failed state.