The World Travelled So Far:
First Leg: New York City, NY, USA - Philadelphia, PA, USA - Lancaster, PA, USA
Second Leg: Lancaster, PA, USA - Washington, DC, USA - Middleburg, VA, USA
Third Leg: Middleburg, VA, USA - Charleston, SC, USA - Huntsville, AL, USA
Fourth Leg: Huntsville, AL, USA - New Orleans, LA, USA
Fifth Leg: New Orleans, LA, USA - Panama City, Panama

Links:

The Official CBS Amazing Race 8 Website