In what year was German philosopher Karl Marx born: 1815, 1818, 1819 or 1820?

What wall divided Berlin from 1961 to 1989?

Which ancient wonder was located in Alexandria, Egypt?

Which empire was ruled by Genghis Khan?

What is the second largest city in Japan?

Around 1680, when King Charles II repaid a debt owed to his father, this 35-year-old man received a huge parcel of land on the western bank of the Delaware River which eventually became a state bearing his name. What was his name?

In June, 1994, the French, British and Americans celebrated the 50th anniversary of what event?