The longest continuous lava tube in Oregon.

Only known mainland rookery of the threatened Stellar sea lion.

Not-so-fearsome tiny trolls live under this wooden train trestle in Portland.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

A heavenly experience, right here on Terra Firma.

Hollowed out cedar log tubs set in an ancient towering forest.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

The magic's in the hole!

This frequently-photographed waterfall takes only a short hike to visit.

A beautiful 62-acre Catholic shrine and botanical garden.

The seamy, underground secrets of Portland's criminal past.

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

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

On the Oregon coast there is a natural hole that seems to be draining the sea.

Harder layers in colorful sandstone weather out as prominent “fins" and even more intricate and bizarre shapes.

Narrow slot canyons in a badland eroded into soft sedimentary rock provide an otherworldly landscape in this remote Nevada state park.

See Hoover Dam and the bypass bridge from a perspective usually off-limits to the public, and float the upper part of the Black Canyon National Water Trail.

This sign designates the road that leads to the infamous Area 51.

US-50 in Nevada is known as "the Loneliest Road in America," but this earlier iteration of the route is even lonelier.

A spectacular but little-known slot canyon in extreme northern Nevada, with sheer walls nearly 500 feet high and a perennial stream.

A hidden slot canyon in the southern Nevada desert makes an unexpected oasis and scenic hike.