1884 - December 6 – The Washington Monument is completed in Washington, D.C., becoming the tallest structure in the world at this date.

On December 6, 1884, a significant moment in American history occurred with the completion of the Washington Monument in Washington, D.C. This iconic obelisk stands as a tribute to George Washington, the first President of the United States and a founding father of the nation. Designed by architect Robert Mills, the monument's construction began in 1848 but faced numerous delays due to financial difficulties and the Civil War. However, on this day, the structure was finally completed, standing proudly as the tallest structure in the world at that time, soaring to a height of 555 feet and 5.125 inches (169.294 meters).