According to legend, you must remain completely silent while passing this man-made mound or suffer the consequences.

The U.S. Navy's last diesel-electric submarine rests half-submerged in the middle of Portland.

Tens of thousands of tiny birds swarm into one school chimney every fall.

This natural marble cave is one of only five national monuments in Oregon.

An old World War II hangar holds 20 vintage aircraft and the rare opportunity to take a ride in a 1940s warbird.

Formerly secret, precariously perched boulders.

The longest continuous lava tube in Oregon.

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.

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

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

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

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.

A creek tumbles over a series of step-like rocks to create this scenic water feature.

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

A volcanic landmark located on an Ice age lake bed.

Massive crater in central Oregon.