During my 2007 Dayton business trip, I had a weekend to fill, so I used it for some Kentucky sightseeing. This included a visit to Red River Gorge Geological Area, an area with a concentration of limestone arches and natural bridges. Many of these are easily accessible via short and medium length hiking trails.

Mark Wasson, http://www.markwasson.com > Trips has detailed summaries of my trips

http://www.markwasson.com/u2007d07adayton.htm