Maine’s only official memorial to the Underground Railroad.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The homestead of American patriot John Adams.

This once prosperous community was home to European settlers and the Ojibwe.

This statue of Olympic hockey coach Herb Brooks immortalizes one of the greatest moments in American sports history.

After the musical legend's death, his memorial was mysteriously graffitied in gold.

This double-arched masonry highway bridge is the only structure of its kind in Minnesota.

One of the few remaining relics of the meatpacking hub that made Chicago the "hog butcher to the world."

An outdoor urban gallery of large-scale artworks by the world's most influential street artists.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

Each year, one talented artist puts on a show sculpting twelve butter-based busts of dairy princesses.

A bit of retro transportation flair preserved in the world's largest department store.

The spaceship-like theater, which is still in use, was one of the most popular exhibits at the 1964 New York World's Fair.

Wisconsin's most celebrated export gets the royal treatment on I-94.

This former nursery supplied plants for the creation of Chicago's largest park.

The house that took a plunge into the facade of a museum.

Elevated freight railway turned wildly successful urban park.

This small shop walked so America could run on Dunkin'.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.

The poems Nathaniel Hawthorne and his wife Sophia etched into its windows are still visible today.

Louisa May Alcott based “Little Women” on her experiences growing up in this house with her sisters.

You have to love a museum with a truly dedicated focus. A focus on Superman, for example.

In the Shawnee National Forest, amazing rock formations peer through the treeline.