Columbus and the surrounding flatlands are not known for waterfalls. Yet some mini-Niagaras lurk in hidden spots. In northwestern Franklin County, the Scioto River flows through a massive layer of Columbus limestone. The rock is so-named because the original core was extracted near the capital city.adcelannotate = {"mobilepaywallcategory" : "MOBILE_PREM-HOME_GARDEN","nativepaywallcategory" : "NATIVE_PREM-HOME_GARDEN"};