Comprised of Spanish war cannons, this sculpture once graced the bow of a WWI warship.

A remote hill on a stretch of country road where the laws of physics are defied... or so it seems.

Covering 37 subterranean acres, this Armillaria gallic is a famous fungus with its own festival.

The menacing creature had a tremendous influence on the local culture before being exposed as a hoax.

This huge stew pot is the focal point of the "Community Soup" event, which honors tradition and soup.

Before he was America’s most famous preservationist, John Muir was an ingenious mechanical inventor.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

Two hula hoops appeared on the tree after a storm, and the collection kept growing.

The World's Largest Bull.

A hidden barn-sized rendition of Grant Wood's most famous, and most parodied, painting.

The Iowa state contender for largest pan in the world oddly only comes in second or so.

A place of great reverence for Trekkies everywhere, a hero's future birthplace.

While there are no actual snakes in the history of this crooked road, there may be a number of dead horses.

A warning to the weak-kneed: This narrow bridge does its swinging eight stories high.

Former hotel turned into haunted playground.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

The oldest university museum west of the Mississippi retains its 19th century feel.

A piece of John the Baptist in the American heartland.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

The world's second largest rocking chair is found on Route 66 in Cuba... Missouri.

Lured here by the promise of tens of thousands in gold, Jesse James started a quintessentially American trend of robbing trains in-motion.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

This simple home was the beginning of a long journey for the iconic Western film star.