Bridges History Design and construction 24 Civil engineering 5 Tunnels 4 Buildings, structures, etc 3 Historic bridges 3 more ... Maintenance and repair 3 Minneapolis Bridge Collapse, Minneapolis, Minn., 2007 3 Social conditions 3 Floods 2 Suspension bridges 2 Aerodynamics 1 Airplanes 1 Architects 1 Architecture, Domestic 1 Battles 1 Bridges, Medieval 1 Bunker Hill, Battle of, Boston, Mass., 1775 1 Canals 1 Civil engineers 1 Construction industry 1 Dams 1 Density 1 Documentary television programs 1 Dwellings 1 Economic development 1 Ferries 1 Foreign relations 1 Geography 1 less ...