Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

Down the road from where the Wright brothers lifted off is another flight tribute practically hidden from sight in the woods.

This abandoned Abraham Lincoln statue has also earned the honorary of "World's Ugliest."

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

Complex aquaponics systems allow fish and plants to grow in harmony.

A museum of the dime museum that features weird entertainments of yesteryear, from feejee mermaids to flea circuses.

One of the largest aviation events in the world brings half a million aircraft enthusiasts to Wisconsin each year.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

The world's longest known cave system.

This life-size bronze statue remembers the tallest recorded human in his Illinois hometown.

The hometown of Popeye's creator is littered with a growing collection of granite cartoon characters.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

The resting place of a Civil War celebrity's amputated limb.

Exact replica of the ancient monument, but much, much lighter.

Outsider art meets paleontology at this roadside reptile repository.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

One of the last surviving C-97s sits in a field in front of a Wisconsin inn.

Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.