Over 12,500 words are scrawled across each room of this historic plantation house and no one knows why.

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

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

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

Offering commanding views of the California coastline, this restaurant was a hub for the artists and bohemians of Big Sur.

A house built from trash known as the poor man's Hearst Castle.

The unbelievably opulent home built for an infamous newspaperman.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

The liveliest ghost town in the state.

There's nothing creepier than a cemetery next to a clown motel.

A building so large that it has its own weather.

A much more welcome kind of snowbird vacationer, manatees camp out in these springs every winter.

North Central Florida's largest flea market and a weekend roadtripper's dream.

A tribute to Ponce de Leon's supposed quest for eternal youth.

The site of one of history's most indelible and horrific tragedies.

Maryland's first (and last standing) toll house on America's first federal road established the state as the "Gateway to the West."

This beautiful stone arch bridge wasn't even expected to stand for one day, but people have been crossing it for centuries.

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

A massive volcanic plug is now a protected area that hosts a number of bird species.

This stretch of beach along California's central coast is a busy highway for the largest seal in the northern hemisphere.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

Commonly referred to as the most photographed Victorian home in the United States.

Shoreline strewn with the remains of ghostly fallen trees.