This massive redwood tree has a hole in the base big enough to drive through.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

A charming desert roadside bakery that produces 10 times more bread daily than it has residents in its town.

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

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

A huge musical instrument played by the ocean.

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

According to legend, you must remain completely silent while passing this man-made mound or suffer the consequences.

A rugged lava field dotted with molds of the ancient pines that were growing when the volcano erupted.

A logging-themed roadside restaurant surrounded by museum-quality machinery and artifacts from the industry's heyday.

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

A tourist attraction founded around a slumping cabin.

A volcanic fissure over two miles long and up to 70 feet deep.

A collection of colorful dinosaurs hidden in an actual rainforest.

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

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

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

Only known mainland rookery of the threatened Stellar sea lion.

An institution that preserves the history of institutionalization.

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