Spangler–Benner Farm

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.

Horner House and Barn, also known as Alexander Horner House and Locust Grive Farm, is a historic home and barn located at Cumberland Township, Adams County, Pennsylvania. The house was built in 1819, and is a 2+1⁄2-story, five-bay vernacular Federal style dwelling. It has a main block and rear ell, and sits on an uncut fieldstone foundation. The bank barn was built in 1840. The barn has two levels and measures 100.5 by 50 ft (30.6 by 15.2 m). Also on the property is a contributing equipment barn, built in 1916, and an early 19th-century detached summer kitchen.It was listed on the National Register of Historic Places in 2007.

Cumberland Township is a township in Adams County, Pennsylvania, United States. The population was 7,033 at the 2020 census. In 1863, the American Civil War Battle of Gettysburg took place mainly in Cumberland Township, which surrounds the borough of Gettysburg on three sides.

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.

Big Round Top is a boulder-strewn hill notable as the topographic high point: 3  of the Gettysburg Battlefield and for 1863 American Civil War engagements for which Medals of Honor were awarded. In addition to battle monuments, a historic postbellum structure on the uninhabited hill is the Big Round Top Observation Tower Foundation Ruin.

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.

Alloway Creek is a 13.5-mile-long (21.7 km) tributary of the Monocacy River in Pennsylvania and Maryland in the United States. Via the Monocacy River, it is part of the Potomac River watershed.

The Starners Dam Bridge is a steel stringer bridge over Alloway Creek on Baptist Road in Taneytown, Carroll County, Maryland, USA. It is also called Alloway Creek Bridge.

Little Round Top is the smaller of two rocky hills south of Gettysburg, Pennsylvania—the companion to the adjacent, taller hill named Big Round Top. It was the site of an unsuccessful assault by Confederate troops against the Union left flank on July 2, 1863, the second day of the Battle of Gettysburg, during the American Civil War. Little Round Top was successfully defended by a brigade under Colonel Strong Vincent, who was mortally wounded during the fighting and died five days later. The 20th Maine Volunteer Infantry Regiment, commanded by Colonel Joshua Lawrence Chamberlain, fought its most famous engagement there, culminating in a dramatic downhill bayonet charge. The battle at Little Round Top subsequently became one of the most well-known actions at Gettysburg, and of the entire war.

The Round Top hospitals during the Battle of Gettysburg were located at the Little Round Top side of the Gettysburg Battlefield at 2 houses now in the community of Round Top, Pennsylvania.