(There are many Roman ruins a short distance from my home. We live close to the Limes, a 300 mile long Roman wall from the 1st and 2nd century, as well as many nearby Roman forts. There are even some Roman ruins in downtown Frankfurt. When we went on this hike, I had assumed we'd see Roman ruins, not ruins from several hundred years earlier.)
A section of one of the inner ringwalls, taken while standing on the wall. Remnants of a stone building can be seen in the middle left.
A section of one of the outer ringwalls. Cities and farms can be seen in the distance.
Another section of an inner ringwall, with a fallen structure. In the background in the trees is another ring wall. (Look carefully and you'll see it.)
This last photo is of forest not far below the Celtic fortifications. The hike from the trailhead to the top of the mountain was a little more than 2 miles (I think--that is my guess based on our hiking time back to the car) and a climb of about 1000 vertical feet. Much of the trail passed through this type of forest.