A giant granite cross remembers missionary Father Frederic Baraga, and his safe passage across an angry Lake Superior.

Minnesota's oldest and deepest mine is now an underground physics laboratory.

A mapping error in the 19th century made loggers think this section of the forest was underwater.

At this Minnesota state park you can easily wade across the source of the mighty Mississippi.

14th century Norse artifacts in Northwestern Minnesota could have proved a Viking landing before Columbus.

A stone face watches over the river.

The only arched bridge made of stone on the entire Mississippi River.

This lab's maddening silence is good for business but bad for sanity.

Secret hideaway for an alternative beach experience.

The basement bowling alley of this St. Paul dive bar is decorated with thousands of dollar bills.

A museum within a museum, devoted to history's most questionable medical devices.

These curious caverns have been home to mushrooms, gangsters, and disco.

The remains of a World War II munitions factory still haunt the fields of this Twin Cities suburb.

Ever wanted to can Spam?

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

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

The highest peak in Utah is the hardest to reach, but only if explorers choose the hard way.

A miraculous natural phenomenon known as "the spring that breathes."

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.

The highest point in Montana is as rugged and singular as the state itself.

The remains of a former logging boom town, crumbled away in the forest.

Defying all odds, this lonely little tree found a home on a log sticking out of a Canadian lake.

A cave interior in the shape of the ancient rhinoceros, created by lava cooling around its carcass.