Stock photography, photos: Homeland security Stock photos of Homeland security blocks off roads to important government buildings Photograph: © Dennis MacDonald Click for a larger image and more information Keywords associated with this stock photo: Washington, DC, D C, USA, Capital, Capitol, Monuments, Museums, Gallery, Galleries, tourist, tourism, travel, destination, Government, Scene, Scenic, Landscape, Recreation, sight, seeing, traveler, sightseer, vacationer, visit, visitor, excursion, day, day tripper, landmark, history, historical, politics, political, nation crowds, treasure, edifice symbol, symbolic, architecture, statue, memorial, Guard, protector, sentinel, sentry, lookout, safeguard, security, protection, safe, safety