Displaying results 181 of 200 - 256
Date Image Innovation City State Country
1940 Pennsylvania Turnpike (Old Section) Pennsylvania Turnpike (Old Section) Harrisburg PA USA
1901 Philadelphia City Hall Philadelphia City Hall Philadelphia PA USA
1801 Philadelphia Municipal Water Supply Philadelphia Municipal Water Supply Philadelphia PA USA
1785 Point of Beginning, U.S. Public Lands Point of Beginning, U.S. Public Lands East Liverpool OH USA
1877 Ponte Maria Pia Bridge Ponte Maria Pia Bridge Oporto Norte Portugal
1787 Portland Head Light Portland Head Light Cape Elizabeth ME USA
1807 Portland Observatory Portland Observatory Portland ME USA
1799 Potowmack Canal and Locks Potowmack Canal and Locks Fairfax County VA USA
1888 Poughkeepsie-Highland Bridge Poughkeepsie-Highland Bridge Poughkeepsie NY USA
750-1180 Prehistoric Mesa Verde Reservoirs Prehistoric Mesa Verde Reservoirs Montezuma County CO USA
1917 Quebec Bridge Quebec Bridge Quebec City Quebec Canada
1909 Queensboro Bridge Queensboro Bridge Long Island City NY USA
1943 Red Hill Underground Fuel Storage Facility Red Hill Underground Fuel Storage Facility Aie HI USA
1824 Russell Sage Laboratory Rensselaer Polytechnic Institute Troy NY USA
1900 Chicago Sanitary and Ship Canal Reversal of the Chicago River Chicago IL USA
1924-1921 River des Peres Sewage & Drainage Works River des Peres Sewage & Drainage Works St. Louis MO USA
1902 Rockville Stone Arch Bridge Rockville Stone Arch Bridge Marysville PA USA
1848 Delaware Aqueduct of the Delaware & Hudson Canal Roebling's Delaware Aqueduct Minisink Ford NY USA
1931 Rogue River Bridge Rogue River Bridge Gold Beach OR USA
1728-1821 Emanuel Bowen's 1747 map showing the boundary between Virginia and North Carolina. Royal Colonial Boundary of 1665 Middlesboro KY USA

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