Step aboard the first ship to circumnavigate North America.

Welcome to the home of the world's largest typewriter company.

Some say that the battle fought at this Kansas site in 1856 was the first unofficial battle of the American Civil War.

No one knows who painted this mysterious mural in a Penn State basement.

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

Standing 191 feet tall and measuring more than 55 feet in circumference, this is the world's tallest spruce tree.

Once home to a thriving oil industry, this town now sits eerily abandoned.

At a rest stop north of Seattle, you can drive through the trunk of an ancient tree.

Secluded springs in the Rio Grande Gorge offer hot bathing beside the haunted ruins of a stagecoach stop.

The final resting place of the world's first nuclear reactor.

Over a thousand feet beneath the Detroit streets is a subterranean metropolis few are allowed to enter.

The world's largest mineral hot springs is home to a herd of bison, a free public bath house, beautiful mineral formations, and a terrifying swinging bridge.

Crystal hunters can dig for their own stones at this DIY mine in Arkansas’ quartz belt.

One of the largest private collections of fossils in the world.

George Washington, Alexander Hamilton, and Benjamin Franklin all slept at this humble inn.

In the Ozarks, a waterfall shoots out from a glorious hole.

What if the cure for all that ails you was as simple as repeated exposure to low-dose radon?

A small shop filled with history, mystery, folklore, and more.

A pair of large white marble lions guard this stretch of the Mojave Desert, and it is utterly mysterious how they got there.

The oldest city park in Walla Walla is home to hundreds of birds, from wood ducks to white peacocks.

This sprawling farm was once a Cold War-era hideaway for the nation's top diplomats.

Half of a waterfall goes into the river while the other half seems to disappear.

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

This building is a recreation of the gatehouse that separated Los Alamos from the outside world during the era of the Manhattan Project.