Site of the greatest known waterfall that ever existed.

Cave carved out of a huge snow drift collapsed killing one and injuring five in July 2015.

This scenic gorge is named after one of the most famous Bigfoot attacks in pseudohistory.

One small town in the Pacific Northwest transformed itself into a Bavarian-themed tourist destination.

The highest point in Washington state is a volcano covered in glaciers.

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

The strange phenomenon causing gravity to "work backwards" on this hill has been blamed on the paranormal.

This long, dark tunnel is open to hikers, but those without lights are known to get confused even on the straight path.

A beautiful final resting place for some of the noteworthy deceased.

A tiny red pebble marks what may be the quietest outdoor spot in the United States.

Rustic natural hot springs in the deciduous rain forest.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

This trail leads to a mine that was used as a sanctuary during the Great Fire of 1910.

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

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

These black pillars of volcanic basalt seem to call mountain climbers with an unbreakable siren song.

This beautiful ancient site is dotted with perforated sandstone pillars considered sacred by some Native American groups.

In the heart of Brigham Young's promised land sits a festering plot of industrial ruin that has been claimed by society's outcasts.

This set of three large, volcanic hot springs is a favorite haunt for intrepid divers.

A dazzling display of red rocks weathered into spires and hoodoos.

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

Jurassic Park—A Still Life.

A Mars simulation in the southern Utah desert.

This ghost town was once a cult-like religious utopian settlement.