The longest navigable underground river in the United States is home to countless blind and albino animals.

The world's largest collection of the world's largest objects is in one small Illinois town.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

The inventor of a number of hybrid corn species is immortalized with a field of giant corn.

What is it about mushrooms that makes people wish they lived inside of them?

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

Where beautiful signs live on forever.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

One of the greatest boxers and humanitarians to ever live chose his hometown as his final resting place.

The largest cemetery in Louisville is the final resting place of Col. Sanders and Muhammad Ali.

The grave of the iconic Kentucky Fried Chicken mascot features a bust of the man behind the goatee.

One of the few surviving "Wigwam"-themed motels.

Prehistoric animals decorate this popular outdoor park.

The world's longest known cave system.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

This replica of the Greek structure is in the heart of Nashville.

This museum is dedicated to the workers that help keep the power on.

Andy Griffith's hometown has made itself up to look like the fictional town of Mayberry.

These unusual rooms on wheels are holdovers from the 1960s.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

A beautiful hidden gem in central West Virginia.

This rural community has attracted both scientists and techno-refugees due to its federally-mandated lack of technology.

A circle of giant painted vases in the former pottery capital of the United States.

A throwback train ride transports passengers through one of the lesser-known national parks in the country.