The seamy, underground secrets of Portland's criminal past.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

A century-old cabin off of Highway 30 touts an unusual construction material: dinosaur bones.

Devilish landscape, once cinema home to giant alien bugs, now derelict roadside attraction.

One man's ambition created this psychedelic log home.

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 prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

A waterfall 600 ft. inside a mountain, once the bane of gold miners, is now a spectacle of nature.

This replica stave church looks like a piece of Norway was simply plopped down in South Dakota.

A butcher shop in Minneapolis has all the meats and cheeses you’d expect from any of its kind—except that all the products are vegan.

20,000 pieces in a Frank Gehry-designed building.

This large midwestern cavern features impressive rock formations and an underground waterfall.

An unfinished rail tunnel that has since been used to house cheese and bats.

"Not too many people can say they've had a nuclear bomb dropped on them, not too many would want to." — Walter Gregg.

An enthusiastically interactive mining museum that won't let black lung ruin the fun.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

Where scientists keep miles of very valuable ice from Antarctica and Greenland from melting.

This super steep hike ascends 2,000 feet in less than a mile.

Abandoned silver mine strewn with wrecked and twisted structures.

The clock that sets them all.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

Rather than a run-of-the-mill franchise hotel, this lodging has been decked out in dinosaur decor.

This naturally-sourced hot spring is now home to a clothing-optional resort.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.