These constructed wetlands naturally filter millions of gallons of treated wastewater every day.

Dedicated to the victims of one of the deadliest hurricanes to strike the United States in recorded history.

The highway's southernmost spot is a beloved local attraction.

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

"We Seceded Where Others Failed."

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

This spiny beast guards an artist's village while vying for the title of largest lobster in the world.

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.

Where monkeys run wild and the humans are caged.

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

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

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

A mysterious castle built as a monument to lost love.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

World's largest Christmas store.

The world’s largest Masonic temple was saved by the White Stripes.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.

Terraced flowerbeds and rock sculptures in the midst of the Minnesota wilderness.

These crudely shaped folk giants may be the the second most photographed statues in the U.S.

At this Minnesota state park you can easily wade across the source of the mighty Mississippi.

Half of a waterfall goes into the river while the other half seems to disappear.