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?

There are quite a few cave-centric units within the National Park System. While these parks provide interesting landscapes both above and below ground, they really are all about the caves. So this month’s Traveler quiz and trivia piece is all about those cave park units.

Carlsbad Caverns National Park, Chaco Culture National Historical Park, and Dinosaur National Monument are among the National Park System sites expected to benefit from rule changes for oil and gas leasing on Bureau of Land Management lands, according to the National Parks Conservation Association.