The Glory Hole is in the Dismal Creek Special Interest Area (AR 21/16 between Fallsville and Edwards Junction), though there are no signs to tell you that or anything else. There are guidebooks that can supply the details. The trail is only about 2 miles round-trip but the return is uphill almost all the way.
Dismal Creek flows down the hill…and disappears right into the Glory Hole…
…and emerges in the cave underneath:
During high water there is probably additional flow over the edge. A broader shot:
The area below the falls is a jumble of big boulders and probably deserves exploration, though I didn’t this time.
There is limited parking here alongside the road and a lot of people seem to know about this place. Even if you are able to park you may return to find yourself boxed-in and waiting for several other parties to return from their hike and move their cars before you can leave.