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I think the last two rural sections of the Interstate Highway system to be filled in were the Alabama riverlands between Mobile and Montgomery, and the Glenwood Canyon through Colorado, so I guess they must have been pretty challenging from an engineering standpoint.
The Home Insurance Building in Chicago (1884) was the first tall building (10 stories) to use structural steel in its construction, and is generally regarded as America's First Skyscraper. It has been demolished. http://en.wikipedia.org/wiki/Home_Insurance_Building
The 23-story Hibernia Bank building in New Orleans was regarded as a wonder, as it is literally floating on semi-liquid ground, and has over 3,000 50-foot pilings beneath it to hold it up.
This list is asking for the man-made wonders of the United States. It doesn't say it has to be built by Americans. So, the Statue of Liberty counts (it was also assembled here, if that's worth anything to you).
Panama sort of counts, but I would limit it to the wonders in America.
Not only that, but the Statue of Liberty is built to a huge scale (no other statue in America even comes close), built on a island and is located on top of an old army fort!
Not only that, but the Statue of Liberty is built to a huge scale (no other statue in America even comes close), built on a island and is located on top of an old army fort!
I don't know how anyone can leave it out. When National Geographic was making a list for the new seven wonders, it included the Statue of Liberty as a finalist (although, it missed out on the top 7). It's the new Colossus. It's symbolically important.
Statue of Liberty, NY
Hoover Dam, NV/AZ
Golden Gate Bridge, CA
New York City Subway System, NY/NJ
Pontchartrain Causeway, LA
Mount Rushmore, SD
KLVY Tower, ND
Seattle Space Needle, WA
Empire State Building, NY
Chrysler Building, NY
Gateway Arch, MO
The Erie Canal, NY
The Panama Canal (Yes, it's not here, but when it was built it technically was.)
Vermilion & Mesabi Range Iron Mines, MN
Transamerica Pryramid, CA
Foshay Tower, MN
The United States Capitol, DC
Evergreen Point Floating Bridge, WA
35W St. Anthony Falls Bridge, MN (because of the speed it was built)
Central Park, NY, it's ironic, yes.
Washington Monument, DC
Cape Hatteras Lighthouse, NC
etc.etc.etc.
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