The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

One of the smallest towns in the United States.

Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.

This 38-drawer structure claims the superlative title, but it isn't the world's only giant filing cabinet.

A gardener's enduring labor of love is spread throughout a small Vermont town.

A 19th century library favored by Edgar Allan Poe and H.P. Lovecraft, known by locals as "the Ath."

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

Thirteen pastel palaces in downtown Charleston add a gorgeous splash of color to the city.

Once the most flame resistant building in the country, the South Carolina Historical Society building was almost burnt down in a fire.

The oldest building in Charleston was used to store gunpowder during the American Revolution.

The state bird of New Mexico, constructed entirely out of garbage.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

This historic Victorian hotel has a scandalous history of affairs and murder.

This expansive bridge in the Canadian wilderness was originally just built for friends.

A tunnel that brings more than a century of history to life from the deepest parts of the Niagara Gorge.

You have to love a museum with a truly dedicated focus. A focus on Superman, for example.

A gem in the small Missouri town where Winston Churchill coined the term "Iron Curtain" and effectively began the Cold War.

A monument to the egos of two railroad magnates that fell into decline along with their careers.

A sycamore tree grown from seeds that traveled to the moon.

When the Austin Dam failed it destroyed much of Austin...and then it failed again.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

This oversized flute-playing Ancestral Puebloan deity is also a landmark of Southwestern kitsch.

A 14-foot-tall Bigfoot statue stands guard over this café and filming location.

This memorial includes fragments from one of the greatest tragedies in United States history.