The Palace of the Parliament in Romania (Bucharest) is one of the heaviest buildings in the world, weighing about 4,098,500 tonnes (9.04 billion pounds), also being the second largest administrative building in the world.

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The Palace of the Parliament in Romania (Bucharest) is one of the heaviest buildings in the world, weighing about 4,098,500 tonnes (9.04 billion pounds), also being the second largest administrative building in the world.