From the Gateway Arch, Rockefeller Center, the Sears Tower, and the Empire State Buiding to the carvings on Mount Rushmore, the Golden Gate Bridge, the Space Needle and Grand Central Terminal, the U.S. has dozens of impressive, important, and iconic structures. Which ones have you been to? Which has had the biggest impact on its local community and on the country? Which one is your favorite?
During World War II, more than a thousand women signed up to fly with the U.S. military as WASPS.
The unusual life of David Vetter, who lived permanently inside a germ-free environment due to severe combined immunodeficiency.
The U.S. and the Soviet Union race to build the hydrogen bomb during the Cold War, thus beginning the nuclear arms race.
The first around-the-world air race was sponsored to prove that the airplane had a commercial future.
The historic journey of Apollo 8 captivated the world in 1968 -- a bright spot in a year marked by political assassinations, race riots, and the Vietnam War.
Major Walter Reed's discovery in 1900 that mosquitoes spread yellow fever halted an outbreak and led to the disease's eventual eradication.
They were the first to brave the unknown.
The worst epidemic in American history killed over 600,000 Americans during World War I.