grandest solar tower, but in terms of buildings have moved beyond the drawing board, it definitely packs a punch. Reportedly, the flaky construction led to dilapidating walls, which were then replaced by a much greener solution -- 7,244 Sharp 80W photovoltaic panels, to be precise. Curiously, only 4,898 of the modules are actually functional, but they still soak up enough sunlight to generate 390-kilowatts of energy, or in layman's terms, enough juice to "power 1,000 PCs for a year." Additionally, the roof is home to two dozen wind turbines that generate 10-percent of the total power used in the building. Of course, such an endeavor did ring up at a steep £5.675 million ($11.4 million), but we're pretty certain this solar panel makeover was concerned with matters other than dollars and cents. Click on through for a top-down shot.