I visited the Appalachian Trail last month, it was incredible!
Oh wow that is a really long trail 2200 miles
Yes I didn't see the whole thing of course.
I hope not that is the longest hiking only trail in the world might take a few years to hike it all. 
I didn't know it was the longest. That's crazy!
Yeah thats why over 2 million people take a hike on a part of it each year
How long has it been a thing?
Its actually not that old is was completed in 1937 after 16 years of development. Alot of improvements and changes continue to this day
What states does it run through?
14 states from Georgia to Maine