These are buildings whose reflective surfaces make them appear to blend into the landscape. They're like the architectural equivalent of the scramble suits from Philip K. Dick's novel A Scanner Darkly.
The 105-storey Ryugyong hotel in Pyongyang, North Korea. Designed by Baikdoosan Architects & Engineers. Construction began in 1987 and stopped between 1992 and 2008. Exterior work is now complete, but it is not known if it will ever open.