An encyclopedic collection of mammal penises.

This stunning concert hall has become a symbol of Iceland's national recovery.

Mariners once used this prehistoric landfill as a navigational landmark.

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

This spooky road cut through a mound of ancient coral might be haunted by a witch.

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

Six miles off the coast of Key West, a former military transport ship is now one of the largest artificial reefs in the world.

After a long career, a disastrous sinking, and a half-successful salvage, this Naval vessel-turned-artificial reef ended up exactly where she was supposed to—with a little help from nature.

These craggy limestone outcrops offer a glimpse at a unique piece of Florida geology.

Brick walkways weave through more than 500 palms and cycads, representing 150 species from around the world.

Long before Europeans arrived, Native Americans built an artificial island out of shells that has withstood a millennia of hurricanes.

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

A striking lighthouse with views of the Gulf of Mexico and of a military air show.

This historic site situated in the Northwood shores neighborhood houses the remains of a forgotten town.

Approximately 65,000 gallons of crystal clear water pour out of this headspring every minute.

Tucked away in Jacksonville's oldest neighborhood, this museum stands as a repository and celebration of outsider art.

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

The mounds on this coastal archaeological site reveal the history of the land’s first inhabitants.

A hidden paradise in one of Florida’s most unique rivers.

Nine Gardens in one—with tea service.

Steaming blood-red hot spring from hell.

The largest volcanic caldera in Japan holds an entire city in its maw.

This active volcano's siren song to suicide jumpers forced authorities to build a fence.

The largest of the Fuji Five Lakes is home to an impressive swan population—some real, some with paddles, and one with an observation deck.