sentences:  Downtown Arkadelphia includes the Arkadelphia Commercial Historic District, the Arkadelphia Confederate Monument, Clark County Courthouse, and the Clark County Library, all listed on the National Register of Historic Places.Other family attractions include the Diamond Lakes Regional Visitors Center on Highway 7 near I-30, and the Reynolds Science Center Planetarium, open to the public during the academic year, is located on the Henderson State University campus.Arkadelphia Parks and Recreation Department operates facilities and manages activities for the community.