A tunnel with windows, so you don't miss out on the impressive views.

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

California's own majestic geyser is powered by a subterranean volcano.

The only road through the heart of Glacier National Park.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

This elaborate towering structure was once famed for its revolutionary height.

Three hundred years of preserved Spanish colonial history in San Antonio.

A burnt orange monolithic dome structure perched on a hillside near Interstate 280.

Travel through the wholesome amusements of yesteryear at this charming miniature village.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

This old mining town, deep in the California desert, has a year-round population of one.

Eulogizing an unknown man's unusual demise.

Two massive rock outcroppings on the Oregon coastline.

This quiet park's strange sedimentary spires were named after Kodak's color film.

There aren't too many operational funiculars around, but Pittsburgh has two!

The interior of the Overlook Hotel in "The Shining" was based on this Yosemite original.

Just a man taking his prehistoric pet for a stroll.

A giant donut stands as a popular symbol of Los Angeles iconography.

A monument celebrating the idea of reaching inaccessible places.

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

The fifth-longest natural arch in the world, and the longest outside China.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

An eatery for UFO seekers on the Extraterrestrial Highway.

This Route 66 classic sports a giant fiberglass rabbit that you can ride.