The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

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

Robots, lasers, and whoopee cushions, oh my!

This picturesque cliffside beacon no longer calls to sailors but shines once a year in honor of a famous shipwreck.

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

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

A treehouse assailed by the elements and the government, now gone.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

The only arched bridge made of stone on the entire Mississippi River.

When flour explodes, it's not a pretty sight.

The Real LegoLand.

Hub of Scandinavian culture in a Minneapolis deli.

A museum within a museum, devoted to history's most questionable medical devices.

The highest point in Wisconsin is capped by two towers that are not as mythic as Tolkien's but provide much better views.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Prehistoric animals decorate this popular outdoor park.

The sweetest graveyard in the world is filled with headstones for dearly de-pinted ice cream flavors.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

A collection of the best toys ever made, The National Toy Hall of Fame is filled with kids, fun, and for some reason, a bird preserve.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

A museum dedicated to man's boldest venture.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.