Put this question to the average person and they might guess avalanche-prone Glacier, towering, windswept Denali or the treacherous Grand Canyon, which is the most dangerous in summer. However ...

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.

Formed over thousands of years of erosion caused by hydrothermal activity, water and other natural forces, the Grand Canyon of the Yellowstone is the primary attraction in the Canyon Village area ...