21 National Monuments Under Construction

Lady Liberty, the Golden Gate Bridge—they didn't just appear there one day. Here's a look at what some of America's greatest monuments looked like before they became the iconic images we know today.

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Need an extra does of famous cityscapes and historic landmarks? Watch the evolution of the New York skyline, get a glimpse of the real Gotham City, take a walk through Hong Kong's Kowloon Walled City, check out 12 remarkable before and after views of cities, or take a look at the architect of Detroit. [Oobject]