Climbers know trees and branches can snag their ropes, but apparently not all climbers know that you're not supposed to cut down trees in national parks without permission. That seems to have been what happened at Acadia National Park, where officials are looking for those responsible for felling trees near the Precipice Trail.

Despite taking in what the Green, Yampa, and other tributaries large and small contribute, the Colorado River is in a death spiral, over-allocated and a victim of growing climate change, left in a state of constant thirst that has made the river the most-endangered in the country, according to American Rivers.

What's the deal with scale and perspective when you're taking photographs in the national parks? It's all about placing things in their proper context...or the context you want to reflect.

Who doesn't like saving money? During National Park Week, April 20-28, you can book a trip running the white water through Canyonlands National Park or Dinosaur National Monument and save as much as $200 per person.