Mount Joy Township, Adams County, Pennsylvania

Two Taverns is an unincorporated community on Pennsylvania Route 97 (Baltimore Pike) between Gettysburg and Littlestown, Pennsylvania. During the Battle of Gettysburg, Kilpatrick's Union cavalry was ordered to the community prior to a charge at the South Cavalry Field.

Germany Township is a township in Adams County, Pennsylvania, United States. The population was 2,844 at the 2020 census. The majority of early settlers were from Germany and Great Britain.

Rock Creek-White Run Union Hospital Complex is a national historic district located at Cumberland Township, Gettysburg, and Mount Joy Township in Adams County, Pennsylvania. The district includes 11 contributing buildings and 13 contributing sites, on 13 contiguous properties including 8 farmsteads and White's Church (or Marks German Reformed Church). The farmsteads are Schwartz Farm, Shaeffer Farm, Trostle Farm, Lewis Bushman Farm, Diener Farm, Conover Farm, Lightner Farm, and Beitler Farm. The properties served as hospitals for the 1st, 2nd, 3rd, 5th, 6th, and 12th corps of the Army of the Potomac during the weeks immediately following the Battle of Gettysburg.It was listed on the National Register of Historic Places in 2000.

White Run is a Pennsylvania stream which flows along the Gettysburg National Military Park (East Cavalry Field) and is an eponym of the Rock Creek-White Run hospital complex for field hospitals of the Battle of Gettysburg. The run's mouth is at Rock Creek near the Trostle Farm along the Sachs Road, site of a hospital east of Round Top, Pennsylvania.

Plum Run is a Pennsylvania stream and tributary of White Run which flows through East Cavalry Field of the Gettysburg National Military Park. The run forms a man-made lake above the Lake Heritage dam near the run's mouth along the Baltimore Pike.

Lake Heritage is a census-designated place (CDP) in Adams County, Pennsylvania, United States. Its population was 2,158 at the 2020 census.

Harney (Monocacyville as late as 1892) is an unincorporated community in Carroll County, Maryland, United States. Harney is also the home of the 'World's Best Carnival'. It has been the home of the Harney Volunteer Fire Company since 1951.

Bonneauville is a borough in Adams County, Pennsylvania. The population was 1,758 at the 2020 census.

Spangler–Benner Farm is a historic farm and national historic district located at Mount Joy Township in Adams County, Pennsylvania. The district includes nine contributing buildings and two contributing structures. The contributing buildings are the sided log farmhouse (1870), frame bank barn (1864), log summer kitchen (1802), smoke house, spring house, wagon sheds, tools sheds, and machine shops. Contributing structures are a wooden silo and metal windmill, erected in 1900. The farm has been in continuous ownership by the same family since 1802.It was listed on the National Register of Historic Places in 1992.

Barlow, Pennsylvania (Horner's Mill during the American Civil War) is a populated place between the Gettysburg Battlefield and the Mason–Dixon line at the intersection of Rock Creek and Pennsylvania Route 134. North of the creek on the road summit is the principal facility of the rural community: the 1939 community hall at the Barlow Volunteer Fire Company fire station. The hall is a Cumberland Township polling place and was used by Mamie & Dwight D. Eisenhower after purchasing their nearby farm (President Eisenhower became an honorary company member in 1955). Horner's Mill was the site of an 1861 Union Civil War encampment, and the covered bridge was used by the II Corps (Union Army) and General George G. Meade en route to the 1863 Battle of Gettysburg. Barlow is located near the U.S. Route 15 interchange to the north and has 3 Taneytown Rd intersections with the Barlow-Greenmount, Barlow, and Barlow-Two Taverns roads. South of the community is a site listed on the National Register of Historic Places (Spangler-Benner Farm) near the Mount Joy Lutheran Church and cemetery. The neighboring communities of Barlow are Greenmount 2.9 mi to the west, Round Top 3.3 mi to the north, Two Taverns 5.1 mi to the east, Harney MD 3.1 mi to the south, and Fairplay 3.2 miles to the southwest.

The Mason and Dixon West Line Milestone Markers 76 and 77 are historic objects that are located in Frederick County, Maryland and Adams County, Pennsylvania, United States, near the community of Harney, Maryland. They are two of the original milestones that mark the Mason-Dixon line between the states of Maryland and Pennsylvania.They were listed on the National Register of Historic Places on August 21, 2018.

Marsh Creek is a 26.6-mile-long (42.8 km) tributary of the Monocacy River in south-central Pennsylvania and north-central Maryland in the United States.Marsh Creek and Rock Creek join below Gettysburg and the Gettysburg Battlefield to form the Monocacy River. The height of land between Marsh and Rock creeks is the site of the Battle of Gettysburg.