Fifteen years later, when Congress again refused to create a national park, President Theodore Roosevelt stretched the limits of the Antiquities Act and established the Grand Canyon National Monument.

At this time, it isn't clear what caused the gas leak, but the trails have been reopened to the public and deemed safe for recreation. Grand Canyon National Park is in the midst o ...

Iconic outdoor destinations like Great Smoky Mountains National Park and the Grand Canyon are justifiably popular, but there are many lesser-known sites to discover, both in the U.S. and abroad.