- Clear Lake, Lake County, California1 objects
- Cliff Palace, Mesa Verde National Park, Montezuma County2 objects
- Cochiti Pueblo, Sandoval County, New Mexico3 objects
- Cologne, North Rhine-Westphalia, Germany1 objects
- Colombo, Sri Lanka1 objects
- Colosseum, ancient Rome2 objects
- Copán (ruins), Honduras1 objects
- Corral Harbor, San Nicolas Island, Southern Channel Islands1 objects
- Coulterville Road, "Upim" Big Meadow, Yosemite National Park3 objects
- Crater Lake, Klamath County, Central Oregon1 objects
- Craters of the Moon, Idaho1 objects
- Crow Agency, Crow Reservation, Big Horn County3 objects
- Crow Reservation, Big Horn County, Montana2 objects
- Debra Damo Monastery, Tigray Region, Ethiopia1 objects
- Deer Creek, Tehama County, California3 objects
- East of Big Eddy, Celilo Canal, Oregon1 objects
- Ecuador30 objects
- Edwards Field, UC Berkeley12 objects
- Egypt1 objects
- Eua Island, Tongatapu Island Group, Tonga1 objects