https://resources.baltimorecountymd.gov/Documents/Planning/historic/landmarkslist.pdf A Baltimore County Landmark or a Baltimore County Historic District (BCHD) is a local historic designation created by the Baltimore County Zoning Code. It recognizes historic properties, sites, buildings, structures, objects, or areas for their significance in Baltimore County and or American history, archaeology, architecture, engineering or culture, and identifies them as worthy of preservation.