National Football League | National Register of Historic Places | National Hockey League | Museum of Modern Art | World Trade Center | Art Deco | England national football team | Metropolitan Museum of Art | center | National Basketball Association | National Science Foundation | National Geographic | National Trust | National Endowment for the Arts | National Geographic Society | Argentina national football team | National Trust for Places of Historic Interest or Natural Beauty | National Park Service | National League | Australian National University | National Guard | National Geographic Channel | National Institutes of Health | National Guard of the United States | National Collegiate Athletic Association | Art Institute of Chicago | United States National Research Council | National Portrait Gallery | National Academy of Sciences | Indian National Congress |
Monahan has shown his sculptures at various galleries, collections, and museums, including the Los Angeles Museum of Contemporary Art, the Chinese European Art Center in Xiamen, Bureau Stedelijk in Amsterdam, The National Center for Art in St. Petersburg, Russia, the Royal Academy and the Saatchi Gallery in London, and Museum Boijmans Van Beuningen, The Stedelijk Museum and the Fries Museum, all in the Netherlands.