Host of the fourth edition of the Solar Energy Bucharest Summit. Located in the centre of Romania's capital, the building has a floor area of 365,000 sq.m and is ranked number 1 in the world in terms of administrative buildings and number 3 in the world in terms of volume. The Palace of Parliament is the heaviest and most expensive building in the world, with 1,000,000 cubic metres of marble and 3,500 tonnes of crystal used in its construction. Its interiors are decorated with 2,800 chandeliers and 220,000 square metres of carpets.