Displaying results 221 of 240 - 256
Date Image Innovation City State Country
1900 Stevens Pass Railroad Tunnels & Switchback System Stevens Pass Railroad Tunnels & Switchback System Stevens Pass WA USA
1821 Lowell Waterpower System Lowell Waterpower System Lowell MA USA
1885 Davis Island Lock and Dam Davis Island Lock and Dam McKees Rocks PA USA
1799 Potowmack Canal and Locks Potowmack Canal and Locks Fairfax County VA USA
1876-1923 East Maui Irrigation System East Maui Irrigation System East Maui HI USA
1894 Bunker Hill Covered Bridge Bunker Hill Covered Bridge Catawba County NC USA
1878 keeseville Bridges of Keeseville Keeseville NY USA
1936 Triborough Bridge Project Triborough Bridge Project New York NY USA
1915 Flight of Five Locks Lockport NY USA
1931 Waldo-Hancock Suspension Bridge Waldo-Hancock Suspension Bridge Stockton Springs ME USA
1926-1929 Atlantic City Convention Hall Atlantic City Convention Hall Atlantic City NJ USA
1937 Golden Gate Bridge Golden Gate Bridge Mill Valley CA USA
1902 Sault Ste. Marie Hydroelectric Complex Sault Ste. Marie Hydroelectric Complex Sault Ste. Marie MI USA
1847-1854 Horseshoe Curve Horseshoe Curve Altoona PA USA
1893 First Concrete Pavement First Concrete Pavement Bellefontaine OH USA
1906 Marshall Building Marshall Building Milwaukee WI USA
1928 Moffat Tunnel Moffat Tunnel Nederland CO USA
1896 Northampton Street Bridge Northampton Street Bridge Easton NJ USA
1862 Bridgeport Covered Bridge Bridgeport Covered Bridge Penn Valley CA USA
1817 Cranetown Triangulation Site Cranetown Triangulation Site Essex County NJ USA

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