This historic bridge connects Whidbey Island to Fidalgo Island across whirlpool-filled waters.

Site of a tragedy on the Oregon Trail.

Site of the greatest known waterfall that ever existed.

One small town in the Pacific Northwest transformed itself into a Bavarian-themed tourist destination.

The highest point in Washington state is a volcano covered in glaciers.

An obscure waterfall that looks like something out of a fantasy novel.

A nearly 200-year-old Catholic mission built to serve the native people of Idaho.

Cross the Continental Divide through an old railroad tunnel, and ride back to the top on a shuttle.

This highest peak in Idaho can only be reached by traversing a formation known as "Chicken-Out Ridge."

This landmark is a central figure in the Nez Perce origin story.

Rare and gorgeous birds abound in this protected wildlife sanctuary.

This set of hot springs also comes with fantastic views.

This trail leads to a mine that was used as a sanctuary during the Great Fire of 1910.

A few dilapidated structures are all that remain of this deserted former silver mining town.

The tallest dam in Montana and top 10 in the country.

A detailed, loving tribute to America's most isolated city.

A thousand years old and the largest of its kind in the world.

This remote Montana battlefield is the site of the Nez Perce Flight of 1877.

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

A memorial to the most decisive Native American victory of the Plains Indian War.

A colossal concrete penguin announces this Montana town as the coldest spot in America. But is it really?

This landmark church at the Flathead Reservation mission features 58 ceiling and wall frescoes painted by the mission's cook.

Crystal clear, drinkable mountain spring water by the side of the road.

This record-setting hydraulic dam in the Montana badlands was one of FDR's most ambitious public works.