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

This massive airship factory is so large that it has its own indoor weather.

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

Ruins of an old sugar mill sitting quietly next to a park in rural Florida.

This natural spring is the winter home to the largest gathering of manatees in the world.

Discover diverse aquatic life and befriend resident turtles at this private diving grotto in north Florida.

Though illegal, city officials have made an exception for this work of art.

This general store is stocked with memorabilia from the 1930s onward—almost none of it for sale.

This impeccably preserved farmstead is a time capsule of a Pulitzer Prize-winning novelist's life.

These winding paths and vertical ramps have been inspiring skateboarders for nearly half a century.

This hauntingly beautiful stretch of Florida coastline is covered in sun-bleached trees.

America's first wax museum opened in 1948.

One of the oldest, tallest, and most haunted lighthouses in America.

Built to replace a house destroyed by a hurricane, this home is made entirely of shipping containers.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

The ruins of a once-thriving sugarcane plantation that was burned in the Second Seminole War.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

Visiting dignitaries and Hollywood stars once stayed at this 1920s hotel, alongside ghosts that are said to haunt its corridors.

The Uros people live on floating reed islands in lake Titicaca.

Explore the flooded remains of a limestone mine in Kentucky.