The world's brightest bioluminescent bay.

On a small Puerto Rican island, banks of secret naval bunkers lie abandoned and filled with piles of office equipment.

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

This tiny home was originally a narrow alleyway.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

The bat-covered home of one of the world's most popular brands of rum is located on a tropical Art Deco campus.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

These red and black houses were awarded to the firefighters who saved their city from an enormous blaze.

An unnatural lake in a naturally beautiful setting.

An artist’s underground sanctuary, 40 years in the making.

An enchanting natural wonder in Puerto Rico's Camuy River Park.

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.

Here, exhibits come with a side of edible history.

This Queens beer hall preserves a German culture and language that is all but lost.

A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

Check out the underground party scene at the "Burning Man of Brooklyn."

An arcade packed with a rotating collection of unique independent video games.

Two community gardens under the elevated subway lines on a very busy commercial strip in Bushwick.

This beloved marketplace mascot poops money and grants good luck.