The NHL district is also a State Antiquities Landmark and contains numerous Recorded Texas Historic Landmarks ( RTHL ) .
The county hosts two districts , one of which is a National Historic Landmark ( NHL ) , and 66 individually listed properties .
The NHL district is also a State Antiquities Landmark and contains numerous Recorded Texas Historic Landmarks ( RTHL ) .
The county hosts two districts , one of which is a National Historic Landmark ( NHL ) , and 66 individually listed properties .