Little Red Lighthouse under the George Washington Bridge.

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

This former sugarcane transport tunnel is now a portal to a lovely beach.

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

The world's second largest single-dish radio telescope, once used to contact E.T.

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