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Palace of the Parliament: the heaviest building on Earth

A palace in Bucharest with 1,100 rooms, eight underground levels and a weight of about 4 million tonnes, built for Nicolae Ceaușescu.

The story

A palace built on a demolished neighborhood

The Palace of the Parliament stands at Strada Izvor 2-4 in Bucharest, on Arsenal Hill. It was commissioned by Nicolae Ceaușescu, with the groundbreaking on 25 June 1984 and construction running through 1997. The chief architect was Anca Petrescu, who supervised about 700 architects.

It has a floor area of 365,000 m², a volume of 2,550,000 m³, 12 floors above ground and eight underground levels, and about 1,100 rooms. It weighs about 4,098,500 tonnes, which makes it the heaviest building in the world.

The cost was about €4 billion as of 2020. About 7 km² of the old city center was demolished and about 40,000 people were relocated. Official data reports 27 deaths during construction, though workers have claimed far higher numbers.

Today it houses the Chamber of Deputies, the Senate and the Constitutional Court, as well as the National Museum of Contemporary Art and a conference center. About 70 percent of the building remains empty.

4,098,500 tweight of the building
1,100rooms, about 400 finished in 2013
365,000 m²floor area

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Practical guide

Plan your Palace of the Parliament trip

Check before you go: Parts of the palace are used by Parliament, so visits are usually by guided tour. Check the official visitor pages for booking rules and ID requirements before you go.

Where it is

  • Strada Izvor 2-4, on Arsenal Hill, at the west end of Bulevardul Unirii in Bucharest.
  • It sits on the site of the old Uranus-Izvor neighborhood.
  • Plan time to walk the boulevard, which is also part of the story.

The numbers

  • 365,000 m² of floor area and a volume of 2,550,000 m³.
  • 84 m above ground and 92 m deep underground.
  • 240 m long and 270 m wide.

Records

  • About 4,098,500 tonnes, the heaviest building in the world.
  • The largest civilian administrative building.
  • The Pentagon is larger but is a military administrative building.

What is inside now

  • The Chamber of Deputies since 1994 and the Senate since 2004.
  • The Constitutional Court and the National Museum of Contemporary Art, opened in 2004.
  • An international conference center.

The cost

  • About €4 billion as of 2020.
  • Earlier estimates were US$1.75 billion in 1989 and US$3 billion in 2006.
  • Between 20,000 and 100,000 people worked on it.

Visiting

  • Visits are usually by guided tour.
  • Check booking rules and ID requirements on the official pages.
  • Only part of the building is open to the public.

Details come from Wikipedia and the official visitor pages, which may not show the latest tour rules or prices. We checked on November 1, 2026. Entry rules, fees and prices change, so confirm them with official sources before you reserve.

Want the full picture? Read our complete Palace of the Parliament travel guide: the numbers, the history, what is inside and how to visit.
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Sources checked November 1, 2026: Wikipedia: Palace of the Parliament · Palace of the Parliament visits