Human-made geographic feature

Maritime Hall Market Square Mary Lyon Residence Hall Maryland Square Masonic Hall Massachusetts Correctional Institution – Cedar Junction Massachusetts Correctional Institution – Concord Massachusetts Correctional Institution – Norfolk Massachusetts Correctional Institution – Plymouth Massachusetts Correctional Institution – Shirley Maurice Lamontagne Institute Mayfair Gardens McCormick Tribune Campus Center McKinley Bank Building McMaster Nuclear Reactor Mechanics Hall Memorial Union Merchandise Building Merck headquarters Metropole Internment Camp Metropolitan District Commission Pumping House Metz Ice Plant Midland Building Milburn building Millennium Place Millennium Tower Miners Foundry Mishawaka Amphitheatre Mo Ranch Modern Press Building Modesto Arch Mohegan Sun at Pocono Downs Our Lady of the Angels Monastery Montana Raceway Park Moorehead Circle Morning Star Boys' Ranch Motif Number 1 Mound Laboratories Mount Savage Iron Works Mountain Pavilion Moving skyscraper Municipal Inn Murray Grove Mystique Great Synagogue National Helium Reserve National Heritage Library National Tennis Centre National Tennis Club National Trail Raceway