The grave of America's 11th president is not in some grand monument but instead it's hidden away on the grounds of the Tennessee Capital.

This presidential tomb was not dedicated until years after Harding's death due to personal controversy.

Look closely and you’ll notice that the color changes a third of the way up the tower.

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

The celebrated eyesore created by starry-eyed sweethearts.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

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

A downtown park built on top of unclaimed graves.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

The oldest experimental corn field in America is still creating better ways to grow crops.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

Home to a protest movement, a bombing, and a dramatic change in labor history.

Partially submerged Buddha heads freckle Chicago’s neighborhoods.

A strange rock in Chicago marks the spot where a tree once stood in honor of the 18th President.

One of the largest pieces of scientific equipment ever carried on a NASA space shuttle sits in a Chicago alley.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

Years of archaeology, just chillin' by the water cooler.

This historic hotel invented the chocolate brownie.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

A mythical bird etched into the face of a rock doubles as the mascot for a nearby school.

The original vault that held the president's remains still stands, empty, not far from where he was finally buried.