A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The world's longest known cave system.

Hidden in Portland’s West Hills, a 170-year-old marker literally stakes out the Pacific Northwest.

A beautiful combination of living flora with preserved bones covers the shelves of this shop.

A natural gas leak provides a flickering flame beneath a waterfall.

The largest earthwork effigy in the world.

A slab of sandstone covered with mysterious 1,000-year-old rock carvings from a vanished North American culture.

This 75-year-old Shakespearean sculpture is painted by a local artist for every season.

Here, visitors can swing with the waves of the Pacific Ocean.