Secrets of Palace of Parliament

The Parliament building in Bucharest is an impressive structure that contains both the lower and upper houses of parliament, as well as three museums and an international conference center. Despite its numerous occupants, 70% of the building remains empty. The building is also the heaviest in the world, weighing in at nearly 4.1 billion kilograms (nearly 9 billion pounds), and is the most expensive government building, valued at around $3.4 billion. However, with its massive size comes a hefty heating and electrical bill of $6 million annually. The building sinks by 6 mm each year due to its weight, and it also contains eight underground levels, including a nuclear bunker linked to the main state institutions by 20 km of catacombs.