The Ryugyong Hotel in Pyongyang was estimated to cost 2% of North Korea’s GDP to construct.
It’s 105 stories tall and incomplete. Construction halted in 1992, perhaps for lack of funds. It has 3000 rooms in a country and city with little tourism. Though it can be seen from every part of Pyongyang, it has been removed from the city’s maps.
Hat tip to Marginal Revolution.