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

On a clear day, you can see all the way to the Virgin Islands from the top of this observation tower built in the 1960s.

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

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

This colorful gate stands as an entrance to the walled city of Old San Juan.

La Cara del Indio honors the Taíno chief who fought bravely against the Spanish invasion of Puerto Rico.

An unnatural lake in a naturally beautiful setting.

This beach pool offers a spectacle of crashing waves, blue hues, and a historical lighthouse.

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

Enjoy the waters of this half-moon-shaped natural pool surrounded by breathtaking scenery.

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

Where the Model T was made and the assembly line was invented.

Weighing 30,000 pounds, this monument represents Detroit's first industrial era.