Palace of Parliament
The building has a surface of 365.000 sqm and holds the 1st position in the Guinness World Records for the largest administrative building (for civil use), and the 3rd place in the world from the volume point of view. It is the heaviest and most expensive building in the world. Now days this sumptuous building hosts the First Chamber of Romanian Senate and Chamber of Deputies.
Find more information here: http://cic.cdep.ro/en