Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

Two mammoth statues inspired by equally tall tales lure tourists to this roadside attraction.

Canyon walls shrouded in ferns.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

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

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

A volcanic landmark located on an Ice age lake bed.

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

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

The first declared National Monument in the United States.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

A fitting attraction for the corn capital of the world.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

Massive crater in central Oregon.

The longest continuous lava tube in Oregon.

Bridges, terraces, and replicas of historic structures all built of rock and petrified wood by one man.

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

A fine, large-aperture telescope available for public use.

A stunning landscape of bunkers that once stored chemical weapons.

An obscure waterfall that looks like something out of a fantasy novel.

One small town in the Pacific Northwest transformed itself into a Bavarian-themed tourist destination.

Site of the greatest known waterfall that ever existed.