Washington Monument
Description
The key monument on the National Mall, a tall obelisk visible from large parts of the city. At the time of visiting the monument was closed as the lifts were being replaced. Once that work has been completed you would be able to take a lift to the top viewing platform at the base of the pyramid on the top of the column.
Charge
Free
Getting There
Latitude: 38.889424; Longitude: -77.035233
What3Words: glaze.ears.scrap
Disclaimer: Details correct at time of writing (25/08/2018), and on time of last update (02/09/2018) but may no longer be accurate, particularly if some time has passed.