The world's only and thus largest collection of its kind celebrates everyday wonder through simple umbrella sheaths.

An ever-updating collection of retro Americana.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

An artistic garden environment of tile mosaic sculptures.

This museum on a college campus pays tribute to the Arctic and to two explorer alumni.

This tiny patch of arid sand sits in one of the greenest states in the United States.

The world's largest rotating world.

This 1,700-pound edible sculpture is way better than your average chocolate mousse.

Its unique collection details the history of the state's svelte railroads.

This industrial area was the dumping ground for massive amounts of trash, some of which washes up as tiny bits of sea glass.

A restored 1920s cascade stairway provides one of the best views of Oakland's Lake Merritt.

Humboldt's human-powered sculptures race across land and sea for days on end in a wacky quest for dominance.

Every year, over 25,000 monarchs overwinter in Pacific Grove.

A huge musical instrument played by the ocean.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Hidden inside this Arizona fast food franchise is an in-depth exhibit on the famed WWII counterintelligence program.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

This cave was hidden for thousands of years, storing the worldly goods of ancient Native Americans.

An outdoor sculpture park of giant pink robots and post-apocalyptic Christmas scenes.

Just a few miles from downtown Atlanta is a trail covered in a crazy collection of outsider art.

Inside this faux cave, visitors can learn how some of their favorite fantasy characters were created.

An unusual and powerful memorial in which earthquake victims are remembered by empty white chairs.

New Zealand's only running funicular railway.

A giant doughnut was given to the small New Zealand town of Springfield to promote "The Simpsons Movie."