4
Niagara Falls
4
Yellowstone National Park
4
Washington Monument
4
The White House
4
Maddy's Massachusetts Diary
4
Mount Rushmore
4
Hoover Dam
4
The Space Needle
4
Gateway Arch
4
The Statue of Liberty
4
The Golden Gate Bridge
4
The Mississippi River
4
U.S.S. Arizona Memorial at Pearl Harbor
4
Grand Canyon
4
The Willis Tower