At the height of its greatness in the late 19th and early 20th century, it included 25% of the world's population and area. What was it?

In what year did the Titanic sink?

What wall divided Berlin from 1961 to 1989?

Which ancient wonder was located in Alexandria, Egypt?

Which empire was ruled by Genghis Khan?

During World War I, the allies, Britain, France, the USA primarily fought against Germany and which two major forces?

What is the second largest city in Japan?