The world's longest known cave system.

Stroll among more than 50 large-scale sculptures created by world-class artists.

The 10th-tallest pyramid in the world, this former sports arena is now home to a massive Bass Pro Shops store.

An ode to "The Queen of Appalachia."

The pan man stands as a testament to the functionality of American cast iron cookware.

A natural sandstone bridge hidden in the Sewanee forest.

The grave of America's 11th president is not in some grand monument but instead it's hidden away on the grounds of the Tennessee Capital.

Over a dozen Native American earth mounds dating back over 2,000 years dot this Tennessee archaeological park.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

The only brothel on the National Register of Historic Places.

Art blooms at this unique outdoor gallery along the banks of the Arkansas River.

A beautiful botanical garden in the heart of the Natural State.

Yup, that's where the name came from.

A home designed to be on the cutting edge of comfortable, low-cost living.

A beautiful South Korean gate and garden in Little Rock honors American Taekwondo.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

A large stone map of Arkansas awaits visitors to its highest point.

An extravagant western hotel where every floor is the "ground floor."

This monumental Jesus is often referred to as "Our Milk Carton With Arms."

This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

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

A stretch of highway even lonelier than the so-called "Loneliest Road in America."

The current Eureka County Courthouse replaced an all-wooden structure that had previously been an ice-skating rink.

A tree bears footwear on the loneliest road in America.