This historic Illinois "Muffler Man" has been converted from axe-touting lumberjack to rocket-wielding space ace.

A tribute to one granddaughter's old apartment which now represents the whims of each visitor.

The world's longest known cave system.

Prehistoric animals decorate this popular outdoor park.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

Experience a charming 1930s version of "infotainment."

Lucha Libre (Mexican Wrestling) themed taco shop.

A building so large that it has its own weather.

One of the only Florida forts to remain in the hands of the Union all through the Civil War still stands as a historic stronghold.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

Thanks to a loophole in property ownership, this alleyway has become a cacophonous street gallery.

The first declared National Monument in the United States.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

Every president in history is immortalized in bronze in downtown Rapid City.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

A fitting attraction for the corn capital of the world.

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

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

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

Downtown Minneapolis mixed art and function by turning some of their sewer covers into works of art.