A memorial for the mustachioed record-setting runner.

The longest continuous lava tube in Oregon.

A sprawling cave network created by a lone lava tube.

This great stone guardian of the forest is a relic from the land's volatile volcanic past.

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

Make it an offering.

"Polynesia on the Plains."

Twin Peaks' real life Double R Diner has been restored to its damn fine television look.

The New Central Library is a masterpiece of contemporary architecture in the midst of downtown Calgary.

Nuclear reactor created the plutonium used on Nagasaki.

Railways may have forged this quintet of lovely tunnels, but now they are open to hikers.

Legend says that these tall basalt pillars are the petrified wives of a trickster god.

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

The old fire tower is one of the last of its kind in the United States.

"Enter and be entertained or annoyed by Dada in Walla Walla."

A sacred lake composed of over 300 separate pools of highly concentrated minerals.

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

Local legend has it that an old, decaying staircase outside this cemetery is haunted by dozens of ghosts.

With over 340,000 artifacts and counting, there is something for everyone, often called the "Smithsonian of the West."

A black cottonwood gets a second life as a home for books.

A classic mystery spot complete with spots that are said to make you shrink or grow when you stand on them.

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

Natural rock water slides hidden in the remote forests of northern Idaho.

Between Missoula and Spokane, a family-owned travel center has an unusual museum in the back.