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

This beachside town is home to a diverse nature reserve, multiple cays, and one of the three bioluminescent bays in Puerto Rico.

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

An unnatural lake in a naturally beautiful setting.

Everyone from Alan Ginsberg to The Rolling Stones has stopped by this classic dive bar.

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

A diorama of the Civil War, fought by cats.

Climb inside an iron crystal magnified 165 billion times its normal size.

Lavish royal estate punctuated with heated greenhouses.

Mountain where Jesus was first tempted by the Devil.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

This cemetery features modernist statues as strange as its name.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

With nickel-steel armor and three-inch thick bullet resistant windows, FDR's train was a rolling fortress.

This beautiful Miami garden was designed as a laboratory for tropical plants.

This downtown Dallas art installation is always on the lookout.

This impressive Boston holy house is the American mecca for Christian scientists.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

A 200-year-old building in the French Quarter that was to be Napoleon's home in the New World.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.