A monument celebrating the idea of reaching inaccessible places.

Get your gift of the gab on Route 66.

An Oklahoma museum that celebrates the history of the "Mother Road."

Iconic figures in concrete and steel in the High Plains of Texas.

This century-old roadside attraction is full of bizarre rock formations.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

Giant papier mache hog sits on private property.

The warmest cave in the Ozarks features two seemingly bottomless lakes.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

A popular place to pick up prehistoric coral fossils from the time when Michigan was an ocean.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

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

This lighthouse and shipwreck museum keep a torch burning for the memory of the SS Edmund Fitzgerald.

These dramatic cola-colored falls have appeared in a poem by Henry Wadsworth Longfellow and a song by Sufjan Stevens.

From a canyon-like gorge, more than 20 million gallons of water emerge every day, while a smaller spring drips down, creating the illusion of an endless, gentle waterfall.

Located along historic Route 66, this former gas station has been restored and converted into a museum filled with vintage motorcycles.

This unusually circular centenarian barn became a Route 66 icon.

The future of roadside attractions is this sci-fi soda mecca that is home to a 66-foot tall neon pop bottle.

This mill has survived a tumultuous past to still produce flour and cornmeal.

The home of a former Minor League baseball team that beat Joe DiMaggio's New York Yankees in 1949.

This hollowed salt dome is the largest oil storage facility in the world, hoarding 250 million barrels of crude oil.

Collection of skeletal systems from the "world's leading supplier of osteological specimens."

One of just a few cities in the world to base their center of government on an island. Others: Paris and Osaka.

What was once a communal kitchen now serves heaping portions of hearty German fare.