The first declared National Monument in the United States.

Yes, this monument is aware that it is about 20 miles away from the actual center of the United States.

One dedicated priest constructed this beautiful stone grotto by hand from 1926-1933.

The humble beginnings of the man known for his lavish "champagne" music.

A four story, football field-sized, nine-grotto creation made of shells, minerals, and rare stones.

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

"The Most Boring Road in the State."

A giant granite cross remembers missionary Father Frederic Baraga, and his safe passage across an angry Lake Superior.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

Come for the springs; stay for the mud bath.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

Small Island off the coast of Greenland.

This peculiar lake of pitch is so thick and viscous that one can walk on its surface.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

This shallow cave got its name from copious amount of human bones found inside.

The highest point in the Kingdom of the Netherlands is on a remote Caribbean island atop a dormant volcano.

The shortest in the world, this landing strip stretches a mere 1,312 feet before steep cliffs on either end plunge into the Caribbean.

A city continually buried under the ash of a volcano that has been erupting for more than 15 years.

The smallest post office in the United States is no bigger than a broom closet.

This 1920s railway depot is now home to two unique museums complete with a miniature train ride.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

In an odd geographic anomaly this city borders two different states on opposite sides of town.

First a root beer ad, then a golf course clubhouse, and finally a massive teapot.

One of the oldest surviving lock houses on the Ohio River.