The People's Salvation Cathedral (Romanian: Catedrala Mantuirii Neamului), also known as the National Cathedral (Romanian: Catedrala Nationala), is an Orthodox cathedral under construction in Bucharest to serve as the patriarchal cathedral of the Romanian Orthodox Church. It is located in central Bucharest on Spirea's Hill (Arsenal Square), facing the same courtyard as the Palace of Parliament which is the heaviest building in the world, the cathedral having a tenth of its weight and about 24% of its volume..