The Gateway Arch in St. Louis, Missouri, holds the title of the tallest monument in the United States, standing at 630 feet (192 meters) tall. It is also the world's tallest arch. However, the definition of "largest" can vary; if you are looking for the tallest stone monument, the San Jacinto Monument in Texas is often cited at 567 feet, which is slightly taller than the Washington Monument (555 feet). If "largest" refers to the total volume or scale of a carved work, the Mount Rushmore National Memorial is unparalleled, with heads measuring 60 feet tall. Another contender for "largest" in terms of physical mass and ongoing construction is the Crazy Horse Memorial in South Dakota; once completed, it is intended to be 641 feet wide and 563 feet high, which would make it the largest sculptural monument in the world. For now, the Gateway Arch remains the most prominent record-holder for height.