A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

The largest wooden building in the world now houses a fascinating collection of aircraft.

This sandstone mansion was the home of two of Oregon's most important pioneers.

Portlandia is the second-largest copper repoussé statue in the United States.

No two pieces are exactly the same at Portland's hippo-themed hardware store.

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

The wooden airship was the largest flying boat ever built.

Home of Howard Hughes' Spruce Goose.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

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

Each winter this underground cave forms a dazzling ice palace.

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

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

A tourist attraction founded around a slumping cabin.

Shakespeare has been brought to life in this open air theater for the better part of a century.

A public fountain that spouts "health water" from a nearby spring.