The world’s largest concentrated solar plant generates as many problems as megawatts.

In the middle of the desert, miles from any human life, sat an anomalous pay phone that still magically answers your calls.

A memorial to the unknown and unheralded men and women of the Cold War military and intelligence services.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

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

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

Upside-down trees serve as natural flower pots in this hanging garden of Alaska.

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

This Art Deco masterpiece has stood in for some of the most famous buildings in comic book history.

Massive crater in central Oregon.

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.

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

An institution that preserves the history of institutionalization.

100-year-old shipwreck you can walk up to at low tide.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

Treehouse motel and treehouse-building school.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

This charmingly homemade amusement park has been growing for 40 years.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

Featuring a casually threatening atmosphere along with dessert and coffee to die for.

This frequently-photographed waterfall takes only a short hike to visit.