The Warsaw Radio Mast (Polish: Maszt radiowy w Konstantynowie) was a radio mast located near Gabin, Poland, and the world's tallest structure at 2,120 ft (646.38 m) from 1974 until its collapse on 8 August 1991.
The mast is located 3 miles (4.8 km) west of Blanchard, North Dakota, halfway between Fargo and Grand Forks. It became the tallest artificial structure, and the first man-made structure to exceed 2,000 feet (610 m) in height, upon the completion of its construction on August 13, 1963.