A Roman-style column in Oregon hides a spiral staircase inside.

Only known mainland rookery of the threatened Stellar sea lion.

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

A French chateau, failed utopian community, odd museum, and Stonehenge replica in rural Washington State.

Native American burial mounds? Giant gopher dens? No one knows what created the Mima Mounds.

Beyond being incredibly fun, not much can be said about the Hole with certitude.