You might want to bring a rain jacket to this travertine triple waterfall.

A short but powerful waterfall resides amid Colorado’s Great Sand Dunes.

The first declared National Monument in the United States.

Seth Bullock, the sheriff of Deadwood, built this town immediately after Teddy Roosevelt’s death in 1919.

A cemetery housing wild west legends in South Dakota.

Before its closure in 2002, this South Dakota mine was the largest and deepest gold mine in Western Hemisphere.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

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

One of the first intercontinental ballistic missile sites in the United States.

Dedicated to the history of the 1,000 nuclear missiles that once covered the Great Plains.

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

Boats and fish both find their way through this massive hydroelectric structure.

A French chateau, failed utopian community, odd museum, and Stonehenge replica in rural Washington State.

A rare tour of a commercial jet assembly plant, held inside one of the largest buildings in the world.

This historic bridge connects Whidbey Island to Fidalgo Island across whirlpool-filled waters.

An abandoned network of military bunkers and tunnels open for anyone willing to descend into the darkness.

Stroll through a wonderland of stupendous moss-covered trees.

An abandoned World War II bunker is part of a chain that runs throughout Washington.

At the most northwestern point of the contiguous United States lies a trail leading through an ancient forest to stunning cliff-side vistas and massive oceanside caves.

Shoreline strewn with the remains of ghostly fallen trees.

A surreal landscape where fanged rocks rise from the ground and the ocean feels like a great mystery.

This large Sitka spruce that appears to be floating in mid-air, has defied logic for years.

Standing 191 feet tall and measuring more than 55 feet in circumference, this is the world's tallest spruce tree.