- Malacañang Palace, Manila, Philippines1 objects
- Malaita Island, Solomon Islands1 objects
- Manila, Manila (Metropolitan), Luzon Island4 objects
- Marcahuamachuco, Huamachuco District, Northern Peru5 objects
- Massachusetts1 objects
- Melanesia49 objects
- Melville Island, Arnhem Land, Northern Territory2 objects
- Merip, Klamath River, Humboldt County1 objects
- Mesa Verde National Park, Mesa Verde, Montezuma County1 objects
- Messenbach, Upper Austria2 objects
- Mexico4 objects
- Missouri1 objects
- Mohave County, Arizona1 objects
- Mokelumne Canyon, Amador and Calaveras Counties, California1 objects
- Montana1 objects
- Mount Lola, Nevada County, California1 objects
- Mount Shasta, Siskiyou County, California5 objects
- Mount Vesuvius, Naples, Italy2 objects
- Mouth of Kanab Creek, Coconino County, Arizona1 objects
- Mouth of San Juan River, San Juan County, Utah1 objects