Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

Permanent exhibit reminds visitors of the Exxon Valdez.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

Thousands of turbines whir at the origin of North American wind power.

A vertically floating hemlock controls the waves and weather at Crater Lake.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

"Only the devil could play golf here."

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

This crumbling Death Valley mining complex was known for its use of giant, 20-mule team wagons.

Spiral labyrinth hidden in the hills above Oakland, CA.

A simple plaque remembers a California island massacre that claimed more than 100 lives.

This Alaska library may be the only one in the country that allows you to check out pieces of taxidermy.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

A surviving remnant of the thick ice mass that once mantled most of Western Canada's mountains.

Odd stone and concrete monuments in the "Poet of the Sierras" eclectic folly garden.

Location of the most powerful laser in the world, and the potential birthplace of tiny stars.

Cows on a ranch are commonplace, scattered cow bones everywhere? Not so much.

This mountaintop beacon is only lit three times a year but shines like some kind of all-seeing eye.

An ominous concrete cube cuts a dystopian silhouette atop this California mountain.

A tribute to the life and work of the beloved "Peanuts" cartoonist.

The most magnificent bottle house in a town strangely full of them.

San Francisco's oldest operating hotel, with a Victorian atmosphere and a "haunted" fourth floor.

NASA's leading space science lab started by a co-founder with deep ties to the occult.