A humid oasis combines recreation with exploration in a unique underwater cavern.

Tombstone of a dog that greeted passengers at the Southern Railway Depot.

Inside this small brick bungalow is a collection of toys intended for the afterlife.

The mysterious 855-foot zigzagging stone wall has been baffling people for centuries.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

Thousands of turbines whir at at the origin of North American wind power.

Quite simply the largest tree in the world (by volume).

The second-largest giant sequoia in the world.

A B-17 bomber stands as a memorial to the residents of Tulare County who served in World War II.

The interior of the Overlook Hotel in "The Shining" was based on this Yosemite original.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

Bad farming practices caused this unnatural natural wonder.

The ruins of a Florida miracle spring resort make it seem like a wonder that this was ever a health spa.

The only Florida state park with publicly accessible caves.

Tucked away in the forests of North Florida resides a 19th-century lighthouse.

For a time this small Florida town of less than 1,000 residents was the national leader in dismemberment.

Georgia may have been on his mind, but this memorial in Florida shows that Greenville was really Ray Charles's childhood home.

This phone booth-sized municipal building has been a piece of police property for more than half a century.

One of the world’s largest and deepest freshwater springs, where mastodons once roamed.

The haunting remains of a failed housing development can still be found behind the big box stores that were to anchor them.

The Tallahassee Airport serves over half a million passengers a year and is home to some permanent residents too.

How Quincy, Florida became the richest town per capita due to one man's shrewd business acumen and taste for fizzy drinks.

A 1950s eccentric's vision of Eden preserved as a hiking trail.