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?

Building roads through Yellowstone is a considerable undertaking given all the thermal ground found throughout the park. Bridges, like the new span across the Yellowstone River near Tower Junction, are especially challenging.

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.