De Kalb County Georgia (Vacant / Not In Use) has 5 places on the National Register of Historic Places including 2 places of National significance and 1 place of Statewide significance. Significant places include Scottish Rite Hospital for Crippled Children, Scottish Rite Hospital for Crippled Children and Callanwolde (Boundary Increase), Decatur Waterworks and Gay, Mary, House.
The famous person Mary Gay is associated with one of more of the De Kalb County historic places.
Some of the country's most noteable architects helped create the De Kalb County places including Neel Reid and Henry Hornbostel. Prominent architectural styles found in De Kalb Country are Colonial Revival, Late Gothic Revival and Tudor Revival.