the appalachian trail is one of the longest trails in the world.
it's also dangerously overhiked. we don't want to tell people not to hike it,
just to try out some other trails first and make sure they're up to the challenge.
to encourage people to go somewhere else first, we created a passport of hiking trails in the national park service.
the passport is divided into levels based on difficulty, with the appalachian trail being the final step.
the entire thing, if you're curious