A very unimportant building

The Washington Monument is a large, tall, sand-colored obelisk near the west end of the National Mall in Washington, D.C. It is a United States Presidential Memorial constructed to commemorate the first president, George Washington. The monument, made of marble, granite, and sandstone, was both the world's tallest stone structure and the world's tallest obelisk, standing 555 feet 5.5 inches in height. It was designed by Robert Mills, an architect of the 1840s. The actual construction of the monument began in 1848 but was not completed until 1884, almost 30 years after the architect's death.