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.
In 1934, American polar explorer Richard Byrd became the first to experience winter in Antarctica's interior.
"The Wizard of Menlo Park," Inventor Thomas Edison, built the first practical light bulb and revolutionized the world.
She set out to save a species… us.
The contradictory history of a dam that became a statement of American power and prestige.
Major Walter Reed's discovery in 1900 that mosquitoes spread yellow fever halted an outbreak and led to the disease's eventual eradication.
The impact of tuberculosis in America, once the deadliest killer in human history.
Engineer James Eads tamed the mighty Mississippi, turning New Orleans into the second largest port in the nation.