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?
, Virginia, West Virginia, Maryland, Pennsylvania, New Jersey, New York, Connecticut, Massachusetts, Vermont, New Hampshire, and Maine.
Thru-hikers attempt to hike the trail in its entirety in a single season. The number of thru-hikes per year has increased steadily, with 715 northbound and 133 southbound thru-hikes reported for 2017. Many books, documentaries, websites, and fan organizations are dedicated to the pursuit. Some hike from one end to the other, then turn around and thru
Appalachian Trail
The Appalachian National Scenic Trail, generally known as the Appalachian Trail or simply the A.T., is a marked hiking trail in the Eastern United States extending between Springer Mountain in Georgia and Mount Katahdin in Maine. The trail is about long, though the exact length changes over time as parts are modified or rerouted. The Appalachian Trail Conservancy describes the Appalachian Trail as the longest hiking-only trail in the world. More than 2 million people are said to take a hike on part of the trail at least once