Heaviest building

The Palace of the Parliament in Bucharest, Romania is believed to be the heaviest building in the world. It is constructed from 700,000 tonnes (1.5 billion lb) of steel and bronze combined with 1 million m³ (35.3 million ft³) of marble, 3,500 tonnes (7.7 million lb) of crystal glass and 900,000 m³ (31.7 million ft³) of wood.

Construction began in 1984.