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.

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]