On President’s Day, the memorial to the founding father, George Washington.
555 feet, 5 and 1/8 inches in height. Up until 23 August 2011, you could actually venture inside the monument and take a trip up to an obeservation deck. However following an earthquake South West of Washington DC, during which several visitors were injured, the interior of the monument was closed and is currently undergoing restoration
The construction was completed in two phases, one private (1848-1854) and one public (1876-1884). If you look closely you may see the change in colour of the marble used in the two phases.