Washington Monument, obelisk in Washington, D.C., honouring George Washington, the first president of the United States. Constructed of granite faced with Maryland marble, the structure is 55 feet (16.8 metres) square at the base and 554 feet 7 inches (169 metres) high and weighs an estimated 91,000 tons.

The "Tall Skinny White" monument is almost certainly the Washington Monument in Washington, D.C. Standing at 555 feet (169 meters), it is the world's tallest stone structure and the world's tallest obelisk. Built to honor George Washington, the first U.S. President, it is constructed of white marble, granite, and bluestone gneiss. A distinctive feature is the "color shift" about one-third of the way up; construction was halted for 20 years due to the Civil War, and when it resumed, the marble was sourced from a different quarry, resulting in a slight change in hue. In 2026, it remains the most recognizable landmark on the National Mall. Visitors can take a high-speed elevator to the observation deck at the 500-foot level for a 360-degree view of the capital, though tickets are highly competitive and must be booked in advance via the National Park Service. It serves as a symbolic "centerpiece" for the city, and by law, no other building in D.C. is permitted to significantly exceed its height, preserving its status as the city's dominant silhouette.