The earthworks that were built nearly 2,000 years ago across the Midwest were not random.

They include places in Ohio that are recognized as important world heritage sites.

Octagons and squares and circles connected by lines.

It's an odd sort of set of earthen works there.

Coming up, we'll look at the mound builder mysteries of Ohio's ancient trail.

It takes commitment to maintain heritage sites like these.

The head of the World Monuments Fund reminds us how preservation projects can bring us together

as we protect places that are at risk of disappearing in our communities and around the world.

America is amazing, first of all, because of its philanthropic culture,

and we have to preserve that because it enriches you as humans.

Plus, a transcontinental pilot tells us what it's like to land a jet airplane.

Pilots will often joke that, you know, no one has to take off, but we do need to land.

It's all in the hour ahead on Travel with Rick Steves.

You can travel all the way to Stonehenge in England to explore a mysterious site

and imagine what it was all about in the distant past.

But there are also impressive prehistoric sites in North America, even where you might least

expect them.

In a minute, Lori Erickson reminds us that earthwork sites, like the Great Serpent Mound in

Ohio, serve as a link with the people who came before us.

How do you protect important heritage sites from the ravages of time and other threats?

Since 1965, the World Monuments

Fund has been trying to safeguard what's irreplaceable around the world. Their latest list adds

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