This small museum gives visitors a chance to soak up the history of the "sponge capital of the world."

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

A graveyard of bathyspheres and diving bells paints a weirdly accurate account of ocean exploration's rickety history.

The highest point in Florida is still the lowest high point in the country.

"We Seceded Where Others Failed."

A building so large that it has its own weather.

A monument celebrating the idea of reaching inaccessible places.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

Florida's oldest bar was once a morgue, complete with a hanging tree and gravestones.

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

Japanese gardens dedicated to the Japanese farmer that refused to throw in the trowel.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

Where manatees are the snowbird vacationers in these balmy Florida springs.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

This museum pays tribute to the Cherokee leader who created a written language for his people.

This museum dedicated to an oft-overlooked support industry features a surprisingly moving brass diorama of a man being saved from a sinking car.

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

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

This historic train station has been converted to a locomotive themed hotel.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

Live long and prosper in Tennessee.

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

A failed utopian experiment for British expats in the American South is now a Victorian village frozen in time.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.