The only road through the heart of Glacier National Park.

The source of America's longest river is also a historical landmark and the start of a famous nude run.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

An architect's childhood fantasy treehouse made real.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

This natural spring is the winter home to the largest gathering of manatees in the world.

The world's largest occupied bat houses hold hundreds of thousands of flying mammals.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

The original span of a high bridge across the deep Crooked River Gorge has been preserved for pedestrian use.

Spectacular volcanic cliffs along the Crooked River invite hiking, rock climbing, and photography.

Bridges, terraces, and replicas of historic structures all built of rock and petrified wood by one man.

Atop an active stratovolcano, two lakes separated by a narrow strip of land.

A rugged lava field dotted with molds of the ancient pines that were growing when the volcano erupted.

Unknown to many, this sparkling turquoise lake hides amid Oregon's snowcapped mountains.

While it is not equipped to peer into outer space this observatory looks like it was built on the moon.

Approximately 50,000 gallons of water gush from these springs, creating the Metolius River.

The steepest tramway in North America provides stunning views of the out-of-the-way Wallowa Mountains in northeastern Oregon.

An extraordinary mixture of natural beauty and man-made phenomena.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

This extravagant Art Nouveau rest stop features a million-dollar view of the Columbia River.

Shakespeare has been brought to life in this open air theater for the better part of a century.

A tourist attraction founded around a slumping cabin.

This natural marble cave is one of only five national monuments in Oregon.

A carnivorous plant paradise in a serpentine bog.