In the 1940s Dr. Walter Freeman gained fame for perfecting the lobotomy, then hailed as a miracle cure for the severely mentally ill. But within a few years, lobotomy was labeled one of the most barbaric mistakes of modern medicine.
After 18 years of struggles, the Golden Gate Bridge opened on May 27, 1937.
In 1934, American polar explorer Richard Byrd became the first to experience winter in Antarctica's interior.
They were the first to brave the unknown.
Engineered by William Barclay Parsons, the 21-mile, four-track route of the New York City Subway was the largest public works project in history.
The impact of tuberculosis in America, once the deadliest killer in human history.
In 1960, Francis Gary Powers' U-2 spy plane was shot down over the Soviet Union.
Robert Moses fueled some of the most ambitious -- and controversial -- public works projects ever conceived.
The worst epidemic in American history killed over 600,000 Americans during World War I.