This "common-as-dirt" museum celebrates the glory of normalcy.

A small but immensely extravagant palace built by the "Night King."

Two nations form a rare four-sided border at the peak of a mountain, philosophical questions result.

The entire length of the border is marked by a 20-foot-wide slash through the trees.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

A monument marks the beginning of the longest north-south road in the United States.

A unique attraction and museum dedicated to exploring iconic roadside structures.

A unique gallery chronicles the losers of American presidential history.

This replica small town lets visitors take a stroll through the story of progress in the U.S. via thousands of Americana artifacts.

It's big, it's a ball, and it's made of twine—the world's largest of its kind.

Roadside display for a popular fruit and vegetable stand.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

This massive blockhead sculpture hides an entire library.

A museum dedicated to the silliest fruit.

This simple apartment may have inspired some of the most important theories in the history of science.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

One of the first big sculptures anywhere in Australia.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

Enormous lake at the bottom of a unique cave system.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.