Fort Farnsworth

Fort Farnsworth is a military fortification in Arlington County built on high ground with earthen walls and trenches. The structure was designed to prevent attacks on Washington coming from the south.

The fort was built in 1862 during the Civil War to protect the Union capital. It formed part of a large network of defensive works surrounding Washington.

The fort reflects military thinking of the 1860s and shows how soldiers built temporary defensive works during wartime. Walking through the grounds reveals the practical decisions made to prepare for threats to the capital.

The National Park Service maintains the grounds with marked paths for visitors to explore the remaining earthen structures. The site is easy to walk through and offers free access to view the defensive works.

The fort was one of approximately 68 fortifications that made Washington one of the most heavily fortified cities in North America. This vast defensive network was so extensive it nearly surrounded the entire city.

Location: Arlington County

Inception: 1862

Part of: Civil War defenses of Washington, D.C.

GPS coordinates: 38.79407,-77.07526

Latest update: December 14, 2025 17:04