The Palace of the Parliament or People's House
Romania - Bucharest
According to the Guinness Book of World Records, the Palace is the world’s largest civilian administrative building, most expensive administrative building as well as the heaviest building. It represents one of the most extravagant and expensive building projects in the history of mankind. Claiming to be the second largest building in the world by surface area. Pentagon (USA) is the world’s largest building. The Palace measures 270m (890ft) by 240m (790ft), 86m (282ft) high, and 92m (302ft) underground. It has 1,100 rooms, 2 underground parking garages and is 12 stories tall.