Find tranquility off the beaten path at the second-tallest mountain in the Smokies, where trails span dozens of miles from Gatlinburg to the summit.

Pennsylvania may not be known for towering peaks, but several mountain ranges wind their way through the state. In fact, the midpoint of the Appalachian Trail is in Pennsylvania. Video above ...

The Himalayas, the highest mountains in the world, were created this way. (In fact, they're still growing.) So were the European Alps. Even the Appalachian Mountains formed when two land masses ...