The Palace of Parliament in Romania, also known as ‘The Peoples’ House’ is the heaviest building in the world, weighing about 4,098,500,000 kilograms. It is also the most expensive administrative building in the world valued at $3.4 billion as of 2008.




The cost of heating and electric use and lighting alone exceeds $6 million per year, which is synonymous with the total cost for powering a medium-sized city. The building was designed by 700 architects under the direction of chief architect Anca Petrescu (1949-2013) and constructed over a period of 13 years (1984–1997).

Spread across 365,000 square meters, the building has 20 floors, 8 of which are underground. There are around 3,000 rooms, two giant halls, and secret tunnels in the building.

Between 20,000 and 100,000 people worked on the site and project, and about 3,000 workers died during the construction of the building.