This record-setting hydraulic dam in the Montana badlands was one of FDR's most ambitious public works.

A smoke stack so large, the Washington Monument could fit inside!

High in the Rockies the third largest statue in the U.S. opens her welcoming arms, and lights up the night sky.

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

An entire town preserved as a historic landmark.

The only road through the heart of Glacier National Park.

New fungal and bacterial species call this deadly lake home.

A plaque commemorates the spot in the Oregon woods where the first-ever Geocache was hidden.

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

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

Home of Howard Hughes' Spruce Goose.

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

This stoic, if derpy, giant stands as a monument to Oregon's statehood and the novelty culture of yesteryear.

Two massive rock outcroppings on the Oregon coastline.

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

Despite a legend that says this highest peak in Oregon was climbed in high heels scores of people have died on its slopes.

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

This extravagant Art Nouveau rest stop features a million-dollar view of the Columbia River.

World's only nuclear reactor operated by liberal arts undergraduates.

A collection of colorful dinosaurs hidden in an actual rainforest.

A massive sea stack famous for its appearance in The Goonies.

The world's smallest park was dedicated in 1948 as the only colony for leprechauns west of Ireland.

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.