Town of Belmont, United States of America
The Platte Mound M is the letter "M" written using whitewashed stones on Platte Mound about four miles east of Platteville, Wisconsin, United States. It is the largest hillside letter "M" in the world. The letter is 241 feet (73 m) high, 214 feet (65 m) wide, with legs 25 feet (7.6 m) wide.
Listen to the audio guide for Platte Mound M Free on WIP — starts by itself when you arrive, even with the screen off