The Crampton's Gap Historic District comprises the battlefield where the American Civil War Battle of Crampton's Gap, part of the larger Battle of South Mountain, took place on September 14, 1862. The district extends on the west to the foot of South Mountain, and to the east of Burkittsville, beyond the eastern foot of the mountain. The district is characterized by steep mountain terrain in the west and open farmland in the east, with the small town of Burkittsville in the center, which is itself listed as a historic district on the National Register of Historic Places. The district extends to the south to include Brownsville Gap. The district includes 98 contributing buildings, 78 of which are in the Burkittsville Historic District. Crampton's Gap at the crest of the mountain is encompas