While precious summer hours are slowly ticking away, fall-like weather may be nice enough to get outside on the weekends for weeks yet. In case you weren't paying attention, fall returns on Sept. 22.

In the absolute darkness 333 feet beneath Tennessee's Cardwell Mountain, I am belly-crawling through a passage barely wider than my shoulders, headlamp cutting through blackness so complete it seems ...

While precious summer hours are slowly ticking away, fall-like weather may be nice enough to get outside on the weekends for weeks yet. Are waterfalls on your list? What about caves? If they aren't, ...