Site of the greatest known waterfall that ever existed.

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

A Seattle oddities shop brimming with Victorian-era gems and antique curio.

A colorful architectural gem in Seattle's uniquely modern Central Library.

This grand old 80-foot sequoia towers above the buildings in the city’s retail center.

This sculpture forces visitors to confront their relationship with space.

Residents of Fremont in Seattle have considered it the center of the universe since the 1970s.

An enclosed rotunda at the Henry Art Gallery in which viewers can look up and see the uninterrupted sky.

A collection of odd-shaped and quirky sounding instruments handmade by a midcentury inventor-composer.

Sweet or salty, super hot or mixed into beer, this is the holy land for all things licorice.

The small town of Poulsbo in Washington state is the next best thing to the Kingdom of Norway.

This large Sitka spruce that appears to be floating in mid-air, has defied logic for years.

The short-lived railroad town in central Oregon has been abandoned since the 1930s.

A sprawling cave network created by a lone lava tube.

A volcanic landmark located on an Ice age lake bed.

A rugged lava field dotted with molds of the ancient pines that were growing when the volcano erupted.

This giant slab of driftwood marks the beginning of the Winnemucca to the Sea Highway.

Small Nevada town embraced its designation as the "Armpit of America" with an Old Spice-sponsored festival.

A desert settlement founded and later abandoned by Hawaiian members of the Church of Jesus Christ of Latter-day Saints in Utah's Skull Valley.

These headstones and a few stone foundations are all that remain of a once-booming mining town.

Where a guard killed nine German prisoners during one of the worst 20th-century POW camp massacres in U.S. history.

A striking, menacing sandstone peak towering above a landscape that's equal parts Mordor and the Moon.

Silver in the hills led to the speedy creation of this boom town and a lack of it saw the town abandoned nearly as quickly.

Paleoamericans built these ancient walls high in the Colorado Rockies as part of an extensive hunting system.