Most-visited and most-photographed slot canyon in the American Southwest.

Rippling sand dunes frozen in the Arizona rock.

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

A rare kind of blue bear can be found chiefly in the national park that shares their name.

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

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

The ghostly remains of what was once the world's richest copper mine.

This frozen tunnel in central Alaska is both an engineering feat and a valuable climate classroom.

The king of U.S. high points towers over every other peak on the continent.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

Orr Park's dead trees have been carved into a menagerie of whimsical visages.

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

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

The oldest badlands in North America, Makoshika State Park takes it name from the Lakota words for broken land.

A little-visited ghost town state park offers a glimpse into Montana’s "Silver Queen."

Mining town from the late 1890s, once home to Calamity Jane.

This off-the-beaten-path abandoned town is a relic of Montana's silver mining boom.

This former shopping outlet is now adorned with beautiful graffiti and murals.

A breathtaking 19th-century trail overlooks Lake Tahoe.

The eerie ruins of an isolated abandoned town nicknamed "the Widowmaker" for its deadly gold mine.

This railroad magnate's 19th century tower is more than a little bit out of place in the Nevada desert.

Nearly 300,000 acres of wildlife, natural splendor, and a hidden ghost town have been designated a national monument.

This massive geographical sculpture is so subtle, it's possible to pass by it without noticing.

This Nevada lake holds its titular natural pyramid and, if the legends are true, a number of dangerous spirits.