I will chime in one more time, that if you're looking for some relics along your hike, a lot of AT & blue blazed trails in Shennandoah NP has a lot of relics such as old homesteads, foundations, ruins, corn cribs, spring houses, chimneys, rusted metal farming equipment, graves, and a myriad of vestiges of the past. They are hard to find in the warmer months, and extremely illegal to disturb year-round, but, if you know where to look, SNP has some great history & vestiges.
But along the length of the AT, the most prominent relics are the old roadbeds/wagon routes that you cross. Most easily found in gaps along the trail, these are relics that you can actually walk on, and if you look closely enough you can see some great stone work/abutments near creeks & water sources. Here in VA, most of this wonderful old stone work & road beds were built by (Irish) immigrant labor in the early 1800s.
Howardsville Pike is the first, and best example of an old colonial grade that comes to mind. It is located at the Humpback Rocks parking area, now blazed blue--and links with the AT. A bit east of this junction are great examples of the stone work i speak of.