An unnatural lake in a naturally beautiful setting.

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

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

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 walls of America's oldest masonry fort famously "swallowed" cannonballs.

A small park on Bourbon Street features life-size bronze statues of New Orleans musicians.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

The South's nickname was supposedly born at a former bank in New Orleans' French Quarter.

The 40-foot-tall votive candle is the largest of its kind.

These boots are made for selfies.

Locals dubbed it the "Owl Building" because of its bird-like appearance.

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

This tiny home was originally a narrow alleyway.

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.

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

The ruins of the first Spanish settlement in Puerto Rico.

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

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

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