Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

Recognized the world over as the home of the McCallisters in the 1990 movie "Home Alone."

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

The site of the first couple's first kiss is commemorated by the most adorable presidential monument ever.

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

A brick-paved former section of the historic coast-to-coast highway.

A fitting attraction for the corn capital of the world.

This French Canadian classic is a specialty of the oldest continually used church in Minneapolis.

This massive roadside mascot was the first version of the giant to illustrate his butt.

For over a century, it was a crucial center of mental health treatment and also the source of many local legends.

The fungus-shaped vintage gas station has served multiple purposes over its lifetime, and now serves ice cream.

17,400 lbs., 12 feet in diameter, and 29 years in the making.

This Minnesota town celebrated the state's 100-year anniversary by creating a massive ode to nature's smartest bird.

America's smallest town is run by its single citizen/mayor/librarian/bartender.

Reputedly the smallest jail in North America.

A mysterious lake provides fresh water without any source, somehow restoring itself from atop its mountaintop perch.

Lady LeWinDa Milkzalot showcases Lewis County's dairy farming heritage and boasts an impressive rotation of seasonal outfits.

Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.

This lone tree and dramatic sandstone outcropping are so beloved by Michiganders they can be found on one of the state’s coins.

Two dozen rescued bears roam (mostly) free at the largest bear ranch in the U.S.

This shallow cave got its name from copious amount of human bones found inside.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

A museum dedicated to the quirky and colorful world created by Springfield's favorite son.