A Roman-style column in Oregon hides a spiral staircase inside.

Post office plaque commemorates local resistance to a cult invasion.

A vertically floating hemlock controls the waves and weather at Crater Lake.

A collection of colorful dinosaurs hidden in an actual rainforest.

You might know it as the Overlook Hotel, but the inside is not going to be familiar.

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.

The lush coastal city of Astoria is riddled with forgotten secret sidewalks.

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

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

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

The site of the Wellington avalanche, one of the America's worst railroad disasters.

A cave interior in the shape of the ancient rhinoceros, created by lava cooling around its carcass.

In Washington's Yakima Valley lies a town "where dinosaurs roam."

Site of the greatest known waterfall that ever existed.

The illuminated falls are a gem in North Cascades National Park.

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

A short hike into the mountainside forest reveals a decaying 1890s town.

Rustic natural hot springs in the deciduous rain forest.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

This captivating Bronze Age timber circle spent centuries concealed by the tides.

L.A.'s oldest operating bowling alley is a beautifully restored homage to its speakeasy days.

Legend says train robbers stashed their gold within the depths of this unusual cave.

One man's quest for the ultimate road trip vehicle.