[Answer] 5. The Great Wall of China was constructed over a period of about 2,000 years from 476 BC-221 BC to 1368-1644 and eventually measuring 5,500 miles but do you know who was the 1st foreigner to explore the whole length of this great structure?

Step 1 : Introduction to the question "5. The Great Wall of China was constructed over a period of about 2,000 years from 476 BC-221 BC to 1368-1644 and eventually measuring 5,500 miles but do you know who was the 1st foreigner to explore the whole length of this great structure?"

...1. Dr. William Edgar Geil 2. Walt Disney 3. Mao Zedong 4. J. Edgar Hoover In 1908 Dr. William Edgar Geil was the first person to traverse the Great Wall of China in 82 days. He visited China four times. In Africa he lived among pygmies and cannibals. He lectured widely in America, England and Australia and wrote 9 books about his travel experiences.

[Answer] In AD 476 the last Western emperor, Romulus Augutulus was overthrown by Odoacer, a barbarian. This is considered by some to be the possible start of which European era?

Step 1 : Introduction to the question "In AD 476 the last Western emperor, Romulus Augutulus was overthrown by Odoacer, a barbarian. This is considered by some to be the possible start of which European era?"

...The "Dark Ages" is a popular, but outdated term for the period from c. 450 A.D. to 750 A.D. (or even later). The name is sometimes interpreted as referring to the "darkness" which followed the period of "light" i.e. the Roman Empire, and sometimes simply as a period which is obscure, due to the relative lack of written records. However, the term has no validity beyond Western Europe, and historians prefer to speak of the "Early Middle Ages", which is less open to value-laden interpretations.