What cave, found in central Kentucky, is the world's longest cave system?

More Questions:

What raconteur and Topkapi star joked that he wanted his tombstone to read "Keep off the grass"?

What pro sport did Althea Gibson play when her tennis career ended?

In the Christmas song, The Holly and The Ivy which one bears the crown?

Edam, Jarlsberg, and Fontina are what types of food?

According to popular wisdom, you should only eat oysters in months whose names contain which letter?

What kind of wine takes its name from the Spanish town of Jerez, where it is made?

What does a "screever" do on a sidewalk?

To counter slipping sales, what was marketed, beginning in 1987, as "the other white meat"?

Where in Canada would you find Mount Queen Elizabeth?

Goitre is mostly caused by what deficiency?

How many episodes of the TV show "All in the Family" were made?

What comedian was a drummer in the early days of the band Steely Dan?

In which movie did Angela Lansbury portray a witch?

Who coached the US basketball "Dream Team" to a gold medal at the 1992 Barcelona Olympic Games?

What military legend was nicknamed "The G.I. General"?