Gathland State Park was once the home of George Alfred Townsend, a noted Civil War journalist. Today, it is the site of a unique collection of buildings that Townsend both designed and constructed, some of which have been restored. In addition, the park is home to a monument dedicated to war correspondents and includes part of the the South Mountain battlefield. The Appalachian Trail also traverses the park.

The park offers tours, exhibits, occasional Civil War reenactments, and a variety of outdoor activities including hiking and backpacking. The website offers an events calendar, visitor information, and a history of the park.

The Howard County Historical Society is dedicated to preserving the history of Howard County, Maryland, from its origins in the colonial days to its current state as a major suburban area of Baltimore. The society owns and operates a local history museum, housed in the historic Presbyterian Church, and a library, which is located in the historic Ellicot City schoolhouse.

The society offers exhibits, guided tours and research resources. The website offers historical information regarding Howard County as well as visitor information.

Fort Washington was originally built in 1809, but was destroyed by its own garrison only five years later. It was rebuilt in 1824 to serve as the only defense for the nation’s capital until the Civil War–when a circle of temporary forts was built around the city. Prior to World War I, Fort Washington was downgraded to harbor defense; and the large guns were removed. During the war, the post was used as a staging area for troops being sent to France.

The park offers artillery demonstrations.

The Thomas Stone National Historic Site consists of 322 acres which contain the restored home of Thomas Stone (1743-1787), one of the men who signed the Declaration of Independence and a participant in the 1785 Mount Vernon Conference. Besides Haberdeventure, the residence Stone purchased in 1770, the site boasts a visitor's center, circa 1840 outbuildings, and the Stone family cemetery.

The site offers guided tours of Haberdeventure, period rooms, an introductory film, exhibits, a mock trial program in accordance with state educational standards, educational outreach programs, Junior Ranger activities, and a picnic site. There are no concessions available on site. Reservations are required for educational programs. The website offers lesson plans, a post-visit Jeopardy game, and a virtual tour of Haberdeventure.

The Captain Salem Avery House, built circa 1860, served as the home of a local fisherman, known as Captain Avery, and his family. The museum presents the history of the Chesapeake Bay's western shore—with a particular focus on the years between 1850 and the present.

The house offers exhibits and a research library. The library collection includes oral histories. The website offers an activity guide for teachers.

Completed by the Baltimore & Ohio Railroad in 1831, this National Historic Landmark is the oldest railroad station in America. The site showcases the people who built and operated America's first railroad, tells stories of soldiers and citizens caught in the turmoil of the Civil War, and highlights the clash of technology that transformed America's transportation systems from roads to rails.

The site offers exhibits, tours, and recreational and educational events (including living history events).