This limestone cave offers an incredible view of the Río Grande de Arecibo valley.

Electrical pylon in the shape of Disney's beloved mouse.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

A historic freight system that found the true gold rush is in tourism.

This tiny square mile of Canadian sand was once considered the world's smallest desert.

Rusting, graffiti-covered tanks litter the beach of this island, once used by the U.S. military for target practice.

The world's brightest bioluminescent bay.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

The highest peak in Puerto Rico is home to a rare fern that can only be found on six trees at its summit.

San Francisco’s condensed garden of incredible plant growth.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

Golden Gate Park's historic collection of plants.