Welcome to the City of Custer, SD. - Junction of highway #16 & #89. Attractions in and around Custer, South Dakota; Black Hills Balloons - Crazy Horse Memorial Avenue of the Chiefs - Custer County 1881 Courthouse Museum - D&B Productions - Flintstone's Bedrock City - Four Mile Old West Town - Jewel Cave National Monument - National Museum of Woodcarving. Nebraska / South Dakota State Line to the Black Hill National Forest Recration Area Black Hills National Forest stretches for 1.2 million acres, offering outdoor adventure like hiking, biking and camping amidst stunning scenery. Find grassy mountain meadows, towering granite peaks, deep canyons, cascading trout streams and clear, clean lakes.