Oregon's only closed-basin hypersaline lake, an important stopover for migrating waterfowl, is in danger of drying up completely.

A large, historic railroad trestle over the Columbia River is now open for non-motorized traffic.

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

An unusual double cinder cone with a bent oval crater, in the Lunar Crater Volcanic Field.

Little is left of this formerly bustling railroad junction on the Transcontinental Railroad.

Railways may have forged this quintet of lovely tunnels, but now they are open to hikers.

Some 46,000 years ago, a volcanic eruption led to a flooding event that carved this short canyon with steep vertical walls.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Rare and gorgeous birds abound in this protected wildlife sanctuary.

This lava tube cave was once a Cold War fallout shelter.

One of the "twins" in these falls on the Snake River was sacrificed for hydropower generation in the 1930s.

This Idaho state park boasts the tallest single-structured sand dune in North America.

These wave-cut overhangs on ancient Lake Chewaucan contain some of the oldest evidence of human habitation in North America.

A volcanic fissure over two miles long and up to 70 feet deep.

Let Ouray’s tallest waterfall sweep your breath away on a dealer’s choice of scenic hikes.

This supper club is a slice of old Las Vegas.

Well-preserved ruins in the Pine Grove Hills of western Nevada.

Two geologically young and nearly circular volcanic subsidence craters, each about a half-mile in diameter, abruptly break the nearly featureless Snake River Plain.

Many believe these images represent interstellar lifeforms.

An eatery for UFO seekers on the Extraterrestrial Highway.

This balancing rock is one of Utah's most unusual geological formations.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

This museum focuses on the history and culture of the German settlers in Pennsylvania.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.