Our Geo Quiz destination is a long highway - some 30,000 miles long. We're talking about the Pan American Highway.

The Guinness Book of World Records says it's "the world's longest motorable road." It goes through 14 countries in North, Central and South America.

But the Pan American Highway is really more of an idea than a single stretch of paved road. It's a collection of roadways. Some existed already -- others were purposely built to be a part of the Pan American project.

There's even a gap, where the road disappears in the rainforests of Panama and Colombia.

Your challenge is to name the U.S. state where you can find the northern end of the Highway -- and the two South American nations that both claim the be home to the southern end.