Grand Mound is a prehistoric burial site in Koochiching County, Minnesota, United States. It is the largest surviving prehistoric structure in the upper Midwest, dating back to 200 BCE.^[2] The site was listed as a National Historic Landmark on June 23, 2011.^[1]

Grand Mound
U.S. National Register of Historic Places
U.S. National Historic Landmark
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Nearest city	International Falls, Minnesota
Coordinates	48°30′48″N 93°42′23.5″W / 48.51333°N 93.706528°W / 48.51333; -93.706528
Area	15.8 acres (6.4 ha)
NRHP reference No.	11000565[1]
Added to NRHP	January 20, 1972

The main burial mound measures 140 feet (43 m) in length and 100 feet (30 m) in width, about 25 feet (7.6 m) high, plus a 200 feet (61 m) tail measuring 12 feet (3.7 m) in width and 3 feet (0.91 m) in height. There are four other smaller earthworks at the site, closer in size to typical burial mounds around the Midwest. Besides the mound, the site contains a number of stratified deposits from villages dating to the Middle Woodland and Late Woodland periods.^[3] The main mound was for many years thought to be typical conical mound, but in the 21st century it was discovered to have a tail, and has been reclassified as an effigy mound, possibly resembling a muskrat.^[4] The mound is part of a larger series of interconnected archaeological sites that include seasonal camp locations and fishing areas.^[5]

The site once had a visitor center operated by the Minnesota Historical Society, opened in 1975. The visitor center was closed in 2003 and the site was closed to the public in 2007, amid concerns that having tourists viewing burial sites was inappropriate. Bill Keyes, the head of the Historical Society's historic sites and museums division, said, "What we heard from tribal elders was that this was like a cemetery, it was a burial ground, and that operating it as a tourist attraction was really not an appropriate way to go."^[2]