A sprawling cave network created by a lone lava tube.

The longest continuous lava tube in Oregon.

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

Gigantic private toy museum featuring among finest collections of antique mechanical banks in existence.

Only known mainland rookery of the threatened Stellar sea lion.

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.

Formerly secret, precariously perched boulders.

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

While it is not equipped to peer into outer space this observatory looks like it was built on the moon.

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

An institution that preserves the history of institutionalization.

This nature center has one of the largest collections of native raptors in the Pacific Northwest.

1920's mining camp and environmental education center is serving to protect the surrounding forest, one of the last of its kind in the Pacific Northwest.