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

The largest earthwork effigy in the world.

A free park where visitors can learn about and collect 440 million-year-old fossils.

Unique tower has outlasted a takeover of the company.

The first KFC is on the National Register of Historic Places.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

This beloved American snack was conceived by a hungry coal miner.

This Tennessee museum is dedicated to a tragic railroad hero who inspired the famous ballad that bears his name.

Yup, that's where the name came from.

Two gushing waterfalls of hot spring water within a block of each other.

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

The only diamond mine in the world where you can keep what you find.

An ode to "The Queen of Appalachia."

While knives are the main feature in this store, visitors will also find dinosaur bones and meteorites.

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.

Elvis's own personal tropical hideaway.

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

This 1,700-pound edible sculpture is way better than your average chocolate mousse.

Soaring mural splashed across 70-year-old silos in Michigan.

A comprehensive archive of Hallmark Holiday ornaments.

This indie movie theater is one of only three surviving Mayan-themed theaters designed by “Detroit’s greatest theater architect.”

This museum in the woods evokes the work and lives of Michigan's 19-century lumberjacks.

This small, nautical gift shop is home to a 500-pound behemoth.

Home to over 300 antique cars and motorcycles, including Thomas Edison's Model A.