Rolling Hills in spring near San Luis Obispo. Morro Bay, USA http://www.terragalleria.com/california/picture.usca9611.html Grasses and rolling hills with pine trees. Wind Cave National Park, South Dakota, USA. http://www.terragalleria.com/parks/np-image.wica20725.html Rolling Hills in spring near San Luis Obispo. Morro Bay, USA http://www.terragalleria.com/california/picture.usca9610.html Ponderosa pines and rolling hills near Gobbler Pass. Wind Cave National Park, South Dakota, USA. http://www.terragalleria.com/parks/np-image.wica8646.html Ponderosa pines on rolling hills. Wind Cave National Park, South Dakota, USA. http://www.terragalleria.com/parks/np-image.wica8644.html Bushes and rolling Hills in summer, Specimen ridge. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell8781.html Wildflowers and rolling hills with trees on crest. Wind Cave National Park, South Dakota, USA. http://www.terragalleria.com/parks/np-image.wica20723.html Rolling hills covered with grasses and scattered pines, dusk. Wind Cave National Park, South Dakota, USA. http://www.terragalleria.com/parks/np-image.wica8654.html Rolling Hills and fog, sunrise. California, USA http://www.terragalleria.com/california/picture.usca30068.html Rolling Hills seen from Laguna Seca. California, USA http://www.terragalleria.com/california/picture.usca30067.html Agave field on rolling hills. Mexico http://www.terragalleria.com/north-america/mexico/mexico-misc/picture.mexi32500.html Rolling hills with ponderosa pines. Wind Cave National Park, South Dakota, USA. http://www.terragalleria.com/parks/np-image.wica8645.html Rolling hills covered with scattered pines, dusk. Wind Cave National Park, South Dakota, USA. http://www.terragalleria.com/parks/np-image.wica8653.html