The monument takes the form of an obelisk, a narrow, tall tapering four-sided structure with a top section that resembles a pyramid in shape. The Washington Monument, fashioned in granite, marble and sandstone has the distinction of being the world's highest obelisk and the world's highest stone structure. It is Washington DC's highest structure; there is a misconception that no building in DC is permitted to be taller, but this is not true.
The design of the monument was assigned to an architect of the 19th century, Robert Mills. The construction