My favorite landmark by far is the Washington Monument.
Ben's Guide (3-5): Statues and Memorials -- The Washington Monument
Located in Washington, DC, at the western end of the National Mall, this four-sided stone structure (modeled after a classic Egyptian obelisk) honors the "Father of our Country," General, Founding Father, and the first president of the United States (1789-1797), George Washington.
At 555 feet 5 1/8 inches (169.29 meters) high, the Washington Monument towers over everything in Washington, DC and is one of the tallest masonry structures in the world. Fifty flags surround the base of the Washington Monument and symbolize the 50 states of the Union. If you take the elevator to the pyramid top, windows in the observation room offer views of the Lincoln Memorial, the White House, the Thomas Jefferson Memorial, and the Capitol building.
NOTE: Robert Mills' original design for the monument was greatly altered in the course of construction and the present monument has little in common with Mills' elaborate plan. His design, a combination of Greek and Egyptian architecture, called for a 600 foot obelisk centered on a circular colonnaded pantheon, 250 feet in diameter and 100 feet high. It was to have 30 spaces set aside between the columns to eventually be filled with statues of prominent Americans, and over the entrance was to be a toga-clad Washington driving a triumphal chariot.
The cornerstone for the monument was laid on July 4, 1848, and the monument was opened to the public on October 9, 1888. In total, there are 36,491 stones. Inserted into the interior walls of the monument are 188 carved stones presented by individuals, societies, cities, states, and nations of the world.
Did you know that there is a "ring" around the monument? Due to several setbacks, the monument stood incomplete at the height of about 150 feet for 25 years. Work resumed in 1880; however, the new marble stones came from a different quarry than the original. There is a discoloration on the outside of the obelisk that clearly marks the older structure from the later one, even though it is the same kind of marble. Since the marble came from three different quarries, it was impossible to match the later marble to the older perfectly