Legend says this little-known stone circle is formed from people petrified as punishment for dancing on the Sabbath.

This tower was constructed to commemorate the man who helped bring true democracy to the United Kingdom.

European castle ruins in an American state park are actually the product of death and grief.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

A wax effigy of St. Valentine hides one of the saint's relics.

Blue-green pools and smooth stones comprise one of Spain’s most idyllic hidden wonders.

The 2,000-year-old pieces of metal are an ancient soldier's military discharge papers.

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

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

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

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

The ruins of the first Spanish settlement in Puerto Rico.

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

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

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

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

This tiny home was originally a narrow alleyway.

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

The highest peak in Puerto Rico is home to a rare fern that can only be found on six trees at its summit.

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

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

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

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

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