The Warren Historic Site is an historic enclave that was once the center of an African American community called Martinsburg that grew up at the end of the Civil War. Located at the intersection of White’s Ferry Road and Martinsburg Road in western Montgomery County, Maryland, it is the last such site in the state of Maryland to retain all three of the structures that were the heart of flourishing African American communities of the late-19th/early-20th century: the church, school, and lodge hall .

No longer an active congregation, the site is cared for by the Warren Historic Site Committee (WHSC), a small group of dedicated volunteers. WHSC oversees the property and holds regular fundraisers to help maintain the buildings and keep them from continued deterioration. The buildings are still used for community events and weddings.