This community-driven organization uses education and eco-friendly technology to protect the environment.

The location of Puerto Rico's first water bottling plant, thanks to a collaboration between Mother Nature and technology.

This 19th-century sugarcane plantation is one of the most well-preserved estates of its kind, including its original quarters for enslaved laborers.

This former railroad bridge was named after the great river that once flowed below it.

A historic, century-old house plopped along the perimeter of Houston's ballpark.

The crumbling remnants of this 19th-century quarantine hospital hint at the touristy island's darker past.

This memorial to a family's dead son has survived a century of hurricanes and earthquakes.

Invading U.S. troops were first seen from this now-abandoned tower, leading to the Spanish-American War.

Legend has it this historic port was a popular hideout and smuggling spot for pirates.

This ''hidden'' 19th-century bridge played a simple, yet important role during the Spanish-American War.

The abandoned remains of this once-thriving hotel looms over the city, awaiting an uncertain future.

This nearly abandoned "company town" is a ghost of Puerto Rico's once-lucrative sugar industry.

This giant bronze image of Christopher Columbus embarked on a voyage of its own.

This small fort played a huge role defending Puerto Rico’s capital city.

Puerto Rico's once thriving oil company is now an abandoned wonderland of rusty steel.

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

This 20th-century mansion plays a key role in one of Puerto Rico's greatest novels.

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

Years of neglect and nature took a toll on this 19th-century lighthouse.