Low-light interior photography takes a little effort at the best of times, and this is with a tripod. Cave shots captured during one of the tours offered at a cave-centric park unit are trickier, because tripods, bipods, and monopods are prohibited. How do you achieve great cave shots without using a tripod during a tour of a cave unit in the National Park System?

Hluhluwe-iMfolozi Park is famous for its large rhino population and yet — more than 60 years after Operation Rhino showed conservation world that the near-impossible could be achieved — the future of these iconic creatures seems less assured than ever.

A hiker was bitten by a bear last week on Glacier National Park's popular Highline trail. A section of the trail is closed until further notice.

Visit these 6 national parks without entrance reservations this fall and winter.