This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

Once on display alongside a giant Gumby, it’s as tall as a nine-story building when fully extended.

The nearly 200-year-old building displays a perplexing grammatical error.

They call this long foot bridge a swinging bridge, but really it's the bouncing you have to watch out for.

Inspired by a foil-wrapped potato, (seriously) the Markel Building has been deemed one of the 10 ugliest buildings in the world.

A home built with marble tombstones from the graves of 2,200 Union soldiers buried in a Virginia cemetery.

A well-preserved relic of the industrial age steel and iron works that dotted West Virginia.

This structure among the trees was the result of divine inspiration.

A bunker "with enough U.S. currency to replenish the cash supply east of the Mississippi" in the event of nuclear war now protects nitrate film.

The crash of this great airship signaled the beginning of the end for dirigibles.

This university transit system is a 1970's vision of the future.

A full-scale replica of a 1774 colonial settlement in Kentucky.

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

Where school buses go to die and be reborn as whimsical works of art.

It took more than 20 years and a sharp eye for one man to assemble this quirky collection.

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

A museum and doll store featuring a surreal and super sanitized version of where babies come from.

A pharmacy built in the shape of a mortar and pestle, now resembles a fancy cocktail.

Unique tower has outlasted a takeover of the company.

The world's largest set of the ten commandments lay nestled in the heart of the Great Smoky Mountains.

Outstanding collection of 19th century medical instruments includes a life-size figure cast from as many as 200 cadavers.

Rare recess caves fill this unbelievably beautiful Ohio park.

Enormous lake at the bottom of a unique cave system.

A failed utopian experiment for British expats in the American South is now a Victorian village frozen in time.