Roadside collection of 65,000 signs.

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

The mayor made the declaration in 2004.

It was once used as a classroom to teach mining skills to local high school students.

After this former brothel closed, its interior remained almost frozen in time.

This trail leads to a mine that was used as a sanctuary during the Great Fire of 1910.

A wild west land agreement was etched right onto this historic Idaho stone.

Protected from the elements, these Native American rock paintings have survived approximately 250 years.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

This unassuming cheese empire in rural Oregon churns out more than 150,000 pounds of cheese each day.

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

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

100-year-old shipwreck you can walk up to at low tide.

From overly ambitious (and eventually abandoned) atomic dream to bustling office park.

A tribute to the Nirvana frontman hides beneath the bridge that was the singer's beloved hangout spot.

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

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.

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

The longest spit in the United States ends at a lighthouse in the Strait of Juan de Fuca.

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

This statue and its surrounding plaques tells the story of Ko-kwal-alwoot and the kinship between the Samish people and the sea.

An American city stranded at the tip of a Canadian peninsula where strict adherence to the "49th parallel rule" became problematic.

An electrifying collection of gadgets and literature from the 16th through 20th centuries.

Former farm staffed by mental patients is now a public park.