Norway's oldest cathedral still in use.

Housing the famous Norwegian ice-defying 19th century polar exploration ship.

At the very tippity-top of Europe is a cliff from which you can view the midnight sun.

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

Walk behind a 50-meter-high waterfall.

Home to three historic ships from the age of Vikings.

A stunning silver lining to global warming's gloomy cloud.

A rock maze opens up to a panoramic viewpoint at an abandoned mine full of ghost stories.

A hidden piece of Altoona's railroad history in a long-forgotten abandoned town.

Descendants of this colonial Pennsylvania family still travel from far and wide to visit the 300-year-old home of their Quaker ancestors.

The site of the little-known Pennsylvania battle that sparked the Seven Years' War.

A small museum along the Susquehanna River is home to a rich collection of Native American artifacts.

A preserved 18th century homestead in Western Pennsylvania marks the spot where the Whiskey Rebellion began.

This colonial mansion has been home to a staggering number of American historic figures.

Memorializing an American tragedy of massive proportions.

A planned settlement in Pennsylvania once housed the aristocratic refugees of the French Revolution.

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

This dramatic rail curve was once the target of a failed Nazi attack.

Steepest flood safety railway in the entire world.

One of the oldest log cabins in America is one of the last of its kind this historic Swedish dwelling remains a piece of living history.

This jail which was in service for over a century is now open for curious visitors.

A field of nothing but boulders which resembles a giant's gravel driveway.

It would take 35 firetrucks to fill this enormous glacial pothole.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.