The Palace of the Parliament, located in Bucharest, Romania, is known as the second largest building complex in the world, after the Pentagon in Washington, D.C. This building is considered the heaviest in the world, weighing approximately 4.1 million tons, which is estimated to be four times heavier than St. Peter's Basilica in the Vatican. Around 700,000 tons of steel, 550,000 tons of cement, and 3,500 tons of crystal were used to construct this building. Additionally, 1 million cubic meters of marble from Transylvania and 900,000 cubic meters of wood were installed. The Palace of Parliament comprises 5,100 rooms and 200 toilets, and its area covers 65,000 square meters.
The Palace of the Parliament in Bucharest was constructed from 1983 to 1989 according to the ideas of dictator Nicolae Ceaușescu, Romanian President.