The Gates of the Mountains trail is a spectacular 49.25-kilometer route in Montana that follows the historic Missouri River corridor with an elevation gain of 1,092 meters. This trail traces the legendary Lewis and Clark National Historic Trail through dramatic limestone cliffs and canyons that Captain Meriwether Lewis named in 1805. With 649 immersive scenes available, hikers can experience the same breathtaking views that greeted the Corps of Discovery over two centuries ago.