Three worldwide (pandemic) outbreaks of influenza. occurred in the 20th century: in 1918, 1957, and 1968. The. latter 2 were in the era of modern virology and most thor-. oughly characterized. All 3 have been informally identified. by their presumed sites of origin as Spanish, Asian, and.
Just south of the Vietnam Veterans Memorial Wall is the Vietnam Womenâs Memorial, which serves to commemorate the 265,000 women that served in the Vietnam War, many of whom worked as nurses.
The Great Wall of China, in Shanhaiguan. The Great Wall of China is an ancient wall in China. The wall is made of cement, rocks, bricks, and powdered dirt. It was built to protect the north of the empire of China from enemy attacks. It is the longest structure humans have ever built.