When did the Sydney Opera House officially open its doors to the public?

More Questions:

Chuck Taylor was the first endorser of what popular brand of shoes?

What does the "64" in "Commodore 64" mean?

What gas makes up approximately 74 percent of the Sun's mass?

How many segments are there for the number 8 on a digital clock?

What decade was Agatha Christie's "Murder on the Orient Express" set in?

What year was singer Pat Benatar born in?

What year did Alfred Hitchcock die?

What name did Weird Al Yankovic gave to his version of "Beat It"?

What type of two-sailed vessel is particularly adept at sailing upwind?

Taking advantage of a fad at the time, what song became a #1 hit for Ray Stevens in 1974?

What was the name of Hannibal's father?

What US state is represented by the figures of George Washington and Robert E. Lee in the Capitol's Statuary Hall?

In the US, freedom of speech was guaranteed by which Constitutional Amendment?

Switzerland and what other country both have square flags?

In which city would you find the Sistine Chapel?