These ancient sacred grounds granted amnesty to those who managed to reach them.

An authentic replica of an Asian temple and garden hidden amongst the natural beauty of Hawai'i.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

The king of U.S. high points towers over every other peak on the continent.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The only road through the heart of Glacier National Park.

Every fall this lake mysteriously drains, like a bathtub with the plug pulled out.

A surviving remnant of the thick ice mass that once mantled most of Western Canada's mountains.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

Race through the maze, get your name on the sign.

Native Americans built this circle of stones, which was used to predict astronomical events.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Once an unstoppable source of gold and silver, this town came to a grinding stop when the groundwater proved deadly.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

The largest source of fossilized insects anywhere.

Even in death, he's still your huckleberry.