- Camden, Camden County, New Jersey1 objects
- Carrizo Rock, San Luis Obispo County, California1 objects
- Casa Grande Ruins, Pinal County, Arizona1 objects
- Cerro de Fraile, Canete Valley, Peru1 objects
- Cerro de Fraile, Cañete Region, Central Peru1 objects
- Chicama Valley, La Libertad Region, Northern Peru1 objects
- Chimu Capac, Supe district, Lima Region1 objects
- China1 objects
- Clear Lake, Lake County, California1 objects
- Cologne, North Rhine-Westphalia, Germany1 objects
- Colombo, Sri Lanka1 objects
- Copán (ruins), Honduras1 objects
- Corral Harbor, San Nicolas Island, Southern Channel Islands1 objects
- Crater Lake, Klamath County, Central Oregon1 objects
- Craters of the Moon, Idaho1 objects
- Debra Damo Monastery, Tigray Region, Ethiopia1 objects
- East of Big Eddy, Celilo Canal, Oregon1 objects
- Egypt1 objects
- Eua Island, Tongatapu Island Group, Tonga1 objects
- Fort Cudahy, Yukon, Canada1 objects