The internationally famous carnival of delights in New York was the birthplace of the hot dog and the roller coaster.
The impact of tuberculosis in America, once the deadliest killer in human history.
Though first seen only as an expensive luxury, Alexander Graham Bell's telephone soon transformed American life and became a necessity.
Major Walter Reed's discovery in 1900 that mosquitoes spread yellow fever halted an outbreak and led to the disease's eventual eradication.
The remarkable story of mid-19th century ingenuity and perseverance during the laying of the transatlantic telegraph cable between North America and Europe.
Equipment failure, human error and bad luck led to the country's worst nuclear accident in 1979.
During the Great Depression, Americans built the Hoover Dam, one of the greatest engineering works in history.
"The Wizard of Menlo Park," Inventor Thomas Edison, built the first practical light bulb and revolutionized the world.